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auto merge of #18743 : nikomatsakis/rust/hrtb-refactor-2, r=pcwalton

Browse Source 
Various miscellaneous changes pushing towards HRTB support:

1. Update parser and adjust ast to support `for<'a,'b>` syntax, both in closures and trait bounds. Warn on the old syntax (not error, for stage0).
2. Refactor TyTrait representation to include a TraitRef.
3. Purge `once_fns` feature gate and `once` keyword.

r? @pcwalton 

This is a [breaking-change]:

- The `once_fns` feature is now officially deprecated. Rewrite using normal closures or unboxed closures.
- The new `for`-based syntax now issues warnings (but not yet errors):
  - `fn<'a>(T) -> U` becomes `for<'a> fn(T) -> U`
  - `<'a> |T| -> U` becomes `for<'a> |T| -> U`
This commit is contained in:
bors 2014-11-09 03:51:41 +00:00
commit a2f303ad09
52 changed files with 748 additions and 736 deletions
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4
src/librustc/lint/builtin.rs
View File

@ -1690,8 +1690,8 @@ impl LintPass for Stability {
for t in supertraits.iter() {
match *t {
ast::TraitTyParamBound(ref t) => {
let id = ty::trait_ref_to_def_id(cx.tcx, t);
self.lint(cx, id, t.path.span);
let id = ty::trait_ref_to_def_id(cx.tcx, &t.trait_ref);
self.lint(cx, id, t.trait_ref.path.span);
}
_ => (/* pass */)
}

5
src/librustc/metadata/tydecode.rs
View File

@ -389,11 +389,10 @@ fn parse_ty(st: &mut PState, conv: conv_did) -> ty::t {
}
'x' => {
assert_eq!(next(st), '[');
let def = parse_def(st, NominalType, |x,y| conv(x,y));
let substs = parse_substs(st, |x,y| conv(x,y));
let trait_ref = parse_trait_ref(st, |x,y| conv(x,y));
let bounds = parse_existential_bounds(st, |x,y| conv(x,y));
assert_eq!(next(st), ']');
return ty::mk_trait(st.tcx, def, substs, bounds);
return ty::mk_trait(st.tcx, trait_ref, bounds);
}
'p' => {
let did = parse_def(st, TypeParameter, |x,y| conv(x,y));

11
src/librustc/metadata/tyencode.rs
View File

@ -231,13 +231,10 @@ fn enc_sty(w: &mut SeekableMemWriter, cx: &ctxt, st: &ty::sty) {
enc_substs(w, cx, substs);
mywrite!(w, "]");
}
ty::ty_trait(box ty::TyTrait {
def_id,
ref substs,
ref bounds
}) => {
mywrite!(w, "x[{}|", (cx.ds)(def_id));
enc_substs(w, cx, substs);
ty::ty_trait(box ty::TyTrait { ref principal,
ref bounds }) => {
mywrite!(w, "x[");
enc_trait_ref(w, cx, principal);
enc_existential_bounds(w, cx, bounds);
mywrite!(w, "]");
}

42
src/librustc/middle/astencode.rs
View File

@ -1085,16 +1085,19 @@ impl<'a> rbml_writer_helpers for Encoder<'a> {
this.emit_enum_variant_arg(1, |this| idx.encode(this))
})
}
ty::UnsizeVtable(ty::TyTrait { def_id,
bounds: ref b,
ref substs },
ty::UnsizeVtable(ty::TyTrait { ref principal,
bounds: ref b },
self_ty) => {
this.emit_enum_variant("UnsizeVtable", 2, 4, |this| {
this.emit_enum_variant_arg(
0, |this| Ok(this.emit_existential_bounds(ecx, b)));
this.emit_enum_variant_arg(1, |this| def_id.encode(this));
this.emit_enum_variant_arg(2, |this| Ok(this.emit_ty(ecx, self_ty)));
this.emit_enum_variant_arg(3, |this| Ok(this.emit_substs(ecx, substs)))
this.emit_enum_variant_arg(0, |this| {
try!(this.emit_struct_field("principal", 0, |this| {
Ok(this.emit_trait_ref(ecx, &*principal))
}));
this.emit_struct_field("bounds", 1, |this| {
Ok(this.emit_existential_bounds(ecx, b))
})
});
this.emit_enum_variant_arg(1, |this| Ok(this.emit_ty(ecx, self_ty)))
})
}
}
@ -1693,18 +1696,19 @@ impl<'a> rbml_decoder_decoder_helpers for reader::Decoder<'a> {
ty::UnsizeStruct(box uk, idx)
}
2 => {
let b =
this.read_enum_variant_arg(
0, |this| Ok(this.read_existential_bounds(dcx))).unwrap();
let def_id: ast::DefId =
this.read_enum_variant_arg(1, |this| Decodable::decode(this)).unwrap();
let ty_trait = try!(this.read_enum_variant_arg(0, |this| {
let principal = try!(this.read_struct_field("principal", 0, |this| {
Ok(this.read_trait_ref(dcx))
}));
Ok(ty::TyTrait {
principal: (*principal).clone(),
bounds: try!(this.read_struct_field("bounds", 1, |this| {
Ok(this.read_existential_bounds(dcx))
})),
})
}));
let self_ty =
this.read_enum_variant_arg(2, |this| Ok(this.read_ty(dcx))).unwrap();
let substs = this.read_enum_variant_arg(3,
|this| Ok(this.read_substs(dcx))).unwrap();
let ty_trait = ty::TyTrait { def_id: def_id.tr(dcx),
bounds: b,
substs: substs };
this.read_enum_variant_arg(1, |this| Ok(this.read_ty(dcx))).unwrap();
ty::UnsizeVtable(ty_trait, self_ty)
}
_ => panic!("bad enum variant for ty::UnsizeKind")

4
src/librustc/middle/privacy.rs
View File

@ -1291,7 +1291,7 @@ impl<'a, 'tcx> VisiblePrivateTypesVisitor<'a, 'tcx> {
match *ty_param_bound {
ast::TraitTyParamBound(ref trait_ref) => {
if !self.tcx.sess.features.borrow().visible_private_types &&
self.path_is_private_type(trait_ref.ref_id) {
self.path_is_private_type(trait_ref.trait_ref.ref_id) {
self.tcx.sess.span_err(span,
"private type in exported type \
parameter bound");
@ -1432,7 +1432,7 @@ impl<'a, 'tcx, 'v> Visitor<'v> for VisiblePrivateTypesVisitor<'a, 'tcx> {
//
// Those in 2. are warned via walk_generics and this
// call here.
visit::walk_trait_ref_helper(self, tr)
self.visit_trait_ref(tr)
}
}
} else if trait_ref.is_none() && self_is_public_path {

30
src/librustc/middle/resolve.rs
View File

@ -33,12 +33,12 @@ use syntax::ast::{ItemTrait, ItemTy, LOCAL_CRATE, Local, ItemConst};
use syntax::ast::{MethodImplItem, Mod, Name, NamedField, NodeId};
use syntax::ast::{Pat, PatEnum, PatIdent, PatLit};
use syntax::ast::{PatRange, PatStruct, Path, PathListIdent, PathListMod};
use syntax::ast::{PrimTy, Public, SelfExplicit, SelfStatic};
use syntax::ast::{PolyTraitRef, PrimTy, Public, SelfExplicit, SelfStatic};
use syntax::ast::{RegionTyParamBound, StmtDecl, StructField};
use syntax::ast::{StructVariantKind, TraitRef, TraitTyParamBound};
use syntax::ast::{TupleVariantKind, Ty, TyBool, TyChar, TyClosure, TyF32};
use syntax::ast::{TyF64, TyFloat, TyI, TyI8, TyI16, TyI32, TyI64, TyInt};
use syntax::ast::{TyParam, TyParamBound, TyPath, TyPtr, TyProc, TyQPath};
use syntax::ast::{TyParam, TyParamBound, TyPath, TyPtr, TyPolyTraitRef, TyProc, TyQPath};
use syntax::ast::{TyRptr, TyStr, TyU, TyU8, TyU16, TyU32, TyU64, TyUint};
use syntax::ast::{TypeImplItem, UnnamedField};
use syntax::ast::{Variant, ViewItem, ViewItemExternCrate};
@ -607,6 +607,7 @@ enum TraitReferenceType {
TraitImplementation, // impl SomeTrait for T { ... }
TraitDerivation, // trait T : SomeTrait { ... }
TraitBoundingTypeParameter, // fn f<T:SomeTrait>() { ... }
TraitObject, // Box<for<'a> SomeTrait>
}
impl NameBindings {
@ -4244,11 +4245,11 @@ impl<'a> Resolver<'a> {
this.resolve_type_parameter_bounds(item.id, bounds,
TraitDerivation);
match unbound {
&Some(ast::TraitTyParamBound(ref tpb)) => {
match *unbound {
Some(ref tpb) => {
this.resolve_trait_reference(item.id, tpb, TraitDerivation);
}
_ => {}
None => {}
}
for trait_item in (*trait_items).iter() {
@ -4495,7 +4496,7 @@ impl<'a> Resolver<'a> {
}
match &type_parameter.unbound {
&Some(ref unbound) =>
self.resolve_type_parameter_bound(
self.resolve_trait_reference(
type_parameter.id, unbound, TraitBoundingTypeParameter),
&None => {}
}
@ -4521,12 +4522,19 @@ impl<'a> Resolver<'a> {
reference_type: TraitReferenceType) {
match *type_parameter_bound {
TraitTyParamBound(ref tref) => {
self.resolve_trait_reference(id, tref, reference_type)
self.resolve_poly_trait_reference(id, tref, reference_type)
}
RegionTyParamBound(..) => {}
}
}
fn resolve_poly_trait_reference(&mut self,
id: NodeId,
poly_trait_reference: &PolyTraitRef,
reference_type: TraitReferenceType) {
self.resolve_trait_reference(id, &poly_trait_reference.trait_ref, reference_type)
}
fn resolve_trait_reference(&mut self,
id: NodeId,
trait_reference: &TraitRef,
@ -4538,6 +4546,7 @@ impl<'a> Resolver<'a> {
TraitBoundingTypeParameter => "bound type parameter with",
TraitImplementation => "implement",
TraitDerivation => "derive",
TraitObject => "reference",
};
let msg = format!("attempt to {} a nonexistent trait `{}`", usage_str, path_str);
@ -5044,6 +5053,13 @@ impl<'a> Resolver<'a> {
visit::walk_ty(self, ty);
}
TyPolyTraitRef(ref poly_trait_ref) => {
self.resolve_poly_trait_reference(
ty.id,
&**poly_trait_ref,
TraitObject);
visit::walk_ty(self, ty);
}
_ => {
// Just resolve embedded types.
visit::walk_ty(self, ty);

159
src/librustc/middle/resolve_lifetime.rs
View File

@ -19,6 +19,7 @@
use driver::session::Session;
use middle::subst;
use std::fmt;
use syntax::ast;
use syntax::codemap::Span;
use syntax::owned_slice::OwnedSlice;
@ -46,18 +47,12 @@ pub enum DefRegion {
// that it corresponds to
pub type NamedRegionMap = NodeMap<DefRegion>;
// Returns an instance of some type that implements std::fmt::Show
fn lifetime_show(lt_name: &ast::Name) -> token::InternedString {
token::get_name(*lt_name)
}
struct LifetimeContext<'a> {
sess: &'a Session,
named_region_map: &'a mut NamedRegionMap,
scope: Scope<'a>
}
#[deriving(Show)]
enum ScopeChain<'a> {
/// EarlyScope(i, ['a, 'b, ...], s) extends s with early-bound
/// lifetimes, assigning indexes 'a => i, 'b => i+1, ... etc.
@ -88,42 +83,32 @@ pub fn krate(sess: &Session, krate: &ast::Crate) -> NamedRegionMap {
impl<'a, 'v> Visitor<'v> for LifetimeContext<'a> {
fn visit_item(&mut self, item: &ast::Item) {
let lifetimes = match item.node {
ast::ItemFn(..) | // fn lifetimes get added in visit_fn below
match item.node {
ast::ItemFn(..) => {
// Fn lifetimes get added in visit_fn below:
self.with(RootScope, |this| visit::walk_item(this, item));
}
ast::ItemMod(..) |
ast::ItemMac(..) |
ast::ItemForeignMod(..) |
ast::ItemStatic(..) | ast::ItemConst(..) => {
self.with(|_, f| f(RootScope), |v| visit::walk_item(v, item));
return;
ast::ItemStatic(..) |
ast::ItemConst(..) => {
// These sorts of items have no lifetime parameters at all.
self.with(RootScope, |this| visit::walk_item(this, item));
}
ast::ItemTy(_, ref generics) |
ast::ItemEnum(_, ref generics) |
ast::ItemStruct(_, ref generics) |
ast::ItemTrait(ref generics, _, _, _) => {
self.with(|scope, f| {
f(EarlyScope(subst::TypeSpace,
&generics.lifetimes,
scope))
}, |v| v.check_lifetime_defs(&generics.lifetimes));
&generics.lifetimes
}
ast::ItemTrait(ref generics, _, _, _) |
ast::ItemImpl(ref generics, _, _, _) => {
self.with(|scope, f| {
f(EarlyScope(subst::TypeSpace,
&generics.lifetimes,
scope))
}, |v| v.check_lifetime_defs(&generics.lifetimes));
&generics.lifetimes
// These kinds of items have only early bound lifetime parameters.
let lifetimes = &generics.lifetimes;
self.with(EarlyScope(subst::TypeSpace, lifetimes, &ROOT_SCOPE), |this| {
this.check_lifetime_defs(lifetimes);
visit::walk_item(this, item);
});
}
};
self.with(|_, f| f(EarlyScope(subst::TypeSpace, lifetimes, &ROOT_SCOPE)), |v| {
debug!("entering scope {}", v.scope);
v.check_lifetime_defs(lifetimes);
visit::walk_item(v, item);
debug!("exiting scope {}", v.scope);
});
}
}
fn visit_fn(&mut self, fk: visit::FnKind<'v>, fd: &'v ast::FnDecl,
@ -131,7 +116,9 @@ impl<'a, 'v> Visitor<'v> for LifetimeContext<'a> {
match fk {
visit::FkItemFn(_, generics, _, _) |
visit::FkMethod(_, generics, _) => {
self.visit_fn_decl(n, generics, |v| visit::walk_fn(v, fk, fd, b, s))
self.visit_early_late(
subst::FnSpace, n, generics,
|this| visit::walk_fn(this, fk, fd, b, s))
}
visit::FkFnBlock(..) => {
visit::walk_fn(self, fk, fd, b, s)
@ -146,22 +133,20 @@ impl<'a, 'v> Visitor<'v> for LifetimeContext<'a> {
_ => return visit::walk_ty(self, ty)
};
self.with(|scope, f| f(LateScope(ty.id, lifetimes, scope)), |v| {
v.check_lifetime_defs(lifetimes);
debug!("pushing fn scope id={} due to type", ty.id);
visit::walk_ty(v, ty);
debug!("popping fn scope id={} due to type", ty.id);
self.with(LateScope(ty.id, lifetimes, self.scope), |this| {
this.check_lifetime_defs(lifetimes);
visit::walk_ty(this, ty);
});
}
fn visit_ty_method(&mut self, m: &ast::TypeMethod) {
self.visit_fn_decl(m.id, &m.generics, |v| visit::walk_ty_method(v, m))
self.visit_early_late(
subst::FnSpace, m.id, &m.generics,
|this| visit::walk_ty_method(this, m))
}
fn visit_block(&mut self, b: &ast::Block) {
debug!("pushing block scope {}", b.id);
self.with(|scope, f| f(BlockScope(b.id, scope)), |v| visit::walk_block(v, b));
debug!("popping block scope {}", b.id);
self.with(BlockScope(b.id, self.scope), |this| visit::walk_block(this, b));
}
fn visit_lifetime_ref(&mut self, lifetime_ref: &ast::Lifetime) {
@ -188,13 +173,16 @@ impl<'a, 'v> Visitor<'v> for LifetimeContext<'a> {
}
impl<'a> LifetimeContext<'a> {
fn with(&mut self, wrap_scope: |Scope, |ScopeChain||, f: |&mut LifetimeContext|) {
let LifetimeContext { sess, ref mut named_region_map, scope} = *self;
wrap_scope(scope, |scope1| f(&mut LifetimeContext {
fn with(&mut self, wrap_scope: ScopeChain, f: |&mut LifetimeContext|) {
let LifetimeContext {sess, ref mut named_region_map, ..} = *self;
let mut this = LifetimeContext {
sess: sess,
named_region_map: *named_region_map,
scope: &scope1
}))
scope: &wrap_scope
};
debug!("entering scope {}", this.scope);
f(&mut this);
debug!("exiting scope {}", this.scope);
}
fn visit_ty_param_bounds(&mut self,
@ -202,7 +190,7 @@ impl<'a> LifetimeContext<'a> {
for bound in bounds.iter() {
match *bound {
ast::TraitTyParamBound(ref trait_ref) => {
self.visit_trait_ref(trait_ref);
self.visit_poly_trait_ref(trait_ref);
}
ast::RegionTyParamBound(ref lifetime) => {
self.visit_lifetime_ref(lifetime);
@ -211,23 +199,27 @@ impl<'a> LifetimeContext<'a> {
}
}
fn visit_trait_ref(&mut self, trait_ref: &ast::TraitRef) {
self.with(|scope, f| {
f(LateScope(trait_ref.ref_id, &trait_ref.lifetimes, scope))
}, |v| {
v.check_lifetime_defs(&trait_ref.lifetimes);
for lifetime in trait_ref.lifetimes.iter() {
v.visit_lifetime_decl(lifetime);
fn visit_poly_trait_ref(&mut self, trait_ref: &ast::PolyTraitRef) {
let ref_id = trait_ref.trait_ref.ref_id;
self.with(LateScope(ref_id, &trait_ref.bound_lifetimes, self.scope), |this| {
this.check_lifetime_defs(&trait_ref.bound_lifetimes);
for lifetime in trait_ref.bound_lifetimes.iter() {
this.visit_lifetime_decl(lifetime);
}
v.visit_path(&trait_ref.path, trait_ref.ref_id);
this.visit_trait_ref(&trait_ref.trait_ref)
})
}
fn visit_trait_ref(&mut self, trait_ref: &ast::TraitRef) {
self.visit_path(&trait_ref.path, trait_ref.ref_id);
}
/// Visits self by adding a scope and handling recursive walk over the contents with `walk`.
fn visit_fn_decl(&mut self,
n: ast::NodeId,
generics: &ast::Generics,
walk: |&mut LifetimeContext|) {
fn visit_early_late(&mut self,
early_space: subst::ParamSpace,
binder_id: ast::NodeId,
generics: &ast::Generics,
walk: |&mut LifetimeContext|) {
/*!
* Handles visiting fns and methods. These are a bit
* complicated because we must distinguish early- vs late-bound
@ -248,33 +240,25 @@ impl<'a> LifetimeContext<'a> {
* numbered sequentially, starting from the lowest index that
* is already in scope (for a fn item, that will be 0, but for
* a method it might not be). Late bound lifetimes are
* resolved by name and associated with a binder id (`n`), so
* resolved by name and associated with a binder id (`binder_id`), so
* the ordering is not important there.
*/
let referenced_idents = early_bound_lifetime_names(generics);
debug!("pushing fn scope id={} due to fn item/method\
referenced_idents={}",
n,
referenced_idents.iter().map(lifetime_show).collect::<Vec<token::InternedString>>());
let lifetimes = &generics.lifetimes;
if referenced_idents.is_empty() {
self.with(|scope, f| f(LateScope(n, lifetimes, scope)), |v| {
v.check_lifetime_defs(lifetimes);
walk(v);
});
} else {
let (early, late) = lifetimes.clone().partition(
|l| referenced_idents.iter().any(|&i| i == l.lifetime.name));
self.with(|scope, f| f(EarlyScope(subst::FnSpace, &early, scope)), |v| {
v.with(|scope1, f| f(LateScope(n, &late, scope1)), |v| {
v.check_lifetime_defs(lifetimes);
walk(v);
});
debug!("visit_early_late: binder_id={} referenced_idents={}",
binder_id,
referenced_idents);
let (early, late) = generics.lifetimes.clone().partition(
|l| referenced_idents.iter().any(|&i| i == l.lifetime.name));
self.with(EarlyScope(early_space, &early, self.scope), |this| {
this.with(LateScope(binder_id, &late, this.scope), |this| {
this.check_lifetime_defs(&generics.lifetimes);
walk(this);
});
}
debug!("popping fn scope id={} due to fn item/method", n);
});
}
fn resolve_lifetime_ref(&mut self, lifetime_ref: &ast::Lifetime) {
@ -525,3 +509,14 @@ fn early_bound_lifetime_names(generics: &ast::Generics) -> Vec<ast::Name> {
}
}
}
impl<'a> fmt::Show for ScopeChain<'a> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
match *self {
EarlyScope(space, defs, _) => write!(fmt, "EarlyScope({}, {})", space, defs),
LateScope(id, defs, _) => write!(fmt, "LateScope({}, {})", id, defs),
BlockScope(id, _) => write!(fmt, "BlockScope({})", id),
RootScope => write!(fmt, "RootScope"),
}
}
}

3
src/librustc/middle/save/mod.rs
View File

@ -710,6 +710,7 @@ impl <'l, 'tcx> DxrVisitor<'l, 'tcx> {
}
};
let trait_ref = &trait_ref.trait_ref;
match self.lookup_type_ref(trait_ref.ref_id) {
Some(id) => {
let sub_span = self.span.sub_span_for_type_name(trait_ref.path.span);
@ -1068,7 +1069,7 @@ impl<'l, 'tcx, 'v> Visitor<'v> for DxrVisitor<'l, 'tcx> {
for bound in param.bounds.iter() {
match *bound {
ast::TraitTyParamBound(ref trait_ref) => {
self.process_trait_ref(trait_ref, None);
self.process_trait_ref(&trait_ref.trait_ref, None);
}
_ => {}
}

2
src/librustc/middle/traits/coherence.rs
View File

@ -143,7 +143,7 @@ pub fn ty_is_local(tcx: &ty::ctxt,
}
ty::ty_trait(ref tt) => {
tt.def_id.krate == ast::LOCAL_CRATE
tt.principal.def_id.krate == ast::LOCAL_CRATE
}
// Type parameters may be bound to types that are not local to

10
src/librustc/middle/trans/debuginfo.rs
View File

@ -423,8 +423,8 @@ impl TypeMap {
from_def_id_and_substs(self,
cx,
trait_data.def_id,
&trait_data.substs,
trait_data.principal.def_id,
&trait_data.principal.substs,
&mut unique_type_id);
},
ty::ty_bare_fn(ty::BareFnTy{ fn_style, abi, ref sig } ) => {
@ -2813,7 +2813,7 @@ fn trait_pointer_metadata(cx: &CrateContext,
// But it does not describe the trait's methods.
let def_id = match ty::get(trait_type).sty {
ty::ty_trait(box ty::TyTrait { def_id, .. }) => def_id,
ty::ty_trait(box ty::TyTrait { ref principal, .. }) => principal.def_id,
_ => {
let pp_type_name = ppaux::ty_to_string(cx.tcx(), trait_type);
cx.sess().bug(format!("debuginfo: Unexpected trait-object type in \
@ -3739,8 +3739,8 @@ fn push_debuginfo_type_name(cx: &CrateContext,
output.push(']');
},
ty::ty_trait(ref trait_data) => {
push_item_name(cx, trait_data.def_id, false, output);
push_type_params(cx, &trait_data.substs, output);
push_item_name(cx, trait_data.principal.def_id, false, output);
push_type_params(cx, &trait_data.principal.substs, output);
},
ty::ty_bare_fn(ty::BareFnTy{ fn_style, abi, ref sig } ) => {
if fn_style == ast::UnsafeFn {

6
src/librustc/middle/trans/expr.rs
View File

@ -324,10 +324,10 @@ fn apply_adjustments<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
_ => bcx.sess().bug(format!("UnsizeStruct with bad sty: {}",
bcx.ty_to_string(unsized_ty)).as_slice())
},
&ty::UnsizeVtable(ty::TyTrait { def_id, ref substs, .. }, _) => {
let substs = substs.with_self_ty(unsized_ty);
&ty::UnsizeVtable(ty::TyTrait { ref principal, .. }, _) => {
let substs = principal.substs.with_self_ty(unsized_ty);
let trait_ref =
Rc::new(ty::TraitRef { def_id: def_id,
Rc::new(ty::TraitRef { def_id: principal.def_id,
substs: substs });
let trait_ref =
trait_ref.subst(bcx.tcx(), &bcx.fcx.param_substs.substs);

69
src/librustc/middle/ty.rs
View File

@ -378,14 +378,14 @@ pub fn type_of_adjust(cx: &ctxt, adj: &AutoAdjustment) -> Option<t> {
fn type_of_autoref(cx: &ctxt, autoref: &AutoRef) -> Option<t> {
match autoref {
&AutoUnsize(ref k) => match k {
&UnsizeVtable(TyTrait { def_id, ref substs, bounds }, _) => {
Some(mk_trait(cx, def_id, substs.clone(), bounds))
&UnsizeVtable(TyTrait { ref principal, bounds }, _) => {
Some(mk_trait(cx, (*principal).clone(), bounds))
}
_ => None
},
&AutoUnsizeUniq(ref k) => match k {
&UnsizeVtable(TyTrait { def_id, ref substs, bounds }, _) => {
Some(mk_uniq(cx, mk_trait(cx, def_id, substs.clone(), bounds)))
&UnsizeVtable(TyTrait { ref principal, bounds }, _) => {
Some(mk_uniq(cx, mk_trait(cx, (*principal).clone(), bounds)))
}
_ => None
},
@ -983,12 +983,12 @@ pub enum sty {
#[deriving(Clone, PartialEq, Eq, Hash, Show)]
pub struct TyTrait {
pub def_id: DefId,
pub substs: Substs,
// Principal trait reference.
pub principal: TraitRef, // would use Rc<TraitRef>, but it runs afoul of some static rules
pub bounds: ExistentialBounds
}
#[deriving(PartialEq, Eq, Hash, Show)]
#[deriving(Clone, PartialEq, Eq, Hash, Show)]
pub struct TraitRef {
pub def_id: DefId,
pub substs: Substs,
@ -1643,8 +1643,8 @@ pub fn mk_t(cx: &ctxt, st: sty) -> t {
&ty_enum(_, ref substs) | &ty_struct(_, ref substs) => {
flags = flags | sflags(substs);
}
&ty_trait(box TyTrait { ref substs, ref bounds, .. }) => {
flags = flags | sflags(substs);
&ty_trait(box TyTrait { ref principal, ref bounds }) => {
flags = flags | sflags(&principal.substs);
flags = flags | flags_for_bounds(bounds);
}
&ty_uniq(tt) | &ty_vec(tt, _) | &ty_open(tt) => {
@ -1874,14 +1874,12 @@ pub fn mk_ctor_fn(cx: &ctxt,
pub fn mk_trait(cx: &ctxt,
did: ast::DefId,
substs: Substs,
principal: ty::TraitRef,
bounds: ExistentialBounds)
-> t {
// take a copy of substs so that we own the vectors inside
let inner = box TyTrait {
def_id: did,
substs: substs,
principal: principal,
bounds: bounds
};
mk_t(cx, ty_trait(inner))
@ -1934,9 +1932,15 @@ pub fn maybe_walk_ty(ty: t, f: |t| -> bool) {
ty_ptr(ref tm) | ty_rptr(_, ref tm) => {
maybe_walk_ty(tm.ty, f);
}
ty_enum(_, ref substs) | ty_struct(_, ref substs) | ty_unboxed_closure(_, _, ref substs) |
ty_trait(box TyTrait { ref substs, .. }) => {
for subty in (*substs).types.iter() {
ty_trait(box TyTrait { ref principal, .. }) => {
for subty in principal.substs.types.iter() {
maybe_walk_ty(*subty, |x| f(x));
}
}
ty_enum(_, ref substs) |
ty_struct(_, ref substs) |
ty_unboxed_closure(_, _, ref substs) => {
for subty in substs.types.iter() {
maybe_walk_ty(*subty, |x| f(x));
}
}
@ -3554,8 +3558,8 @@ pub fn unsize_ty(cx: &ctxt,
format!("UnsizeStruct with bad sty: {}",
ty_to_string(cx, ty)).as_slice())
},
&UnsizeVtable(TyTrait { def_id, ref substs, bounds }, _) => {
mk_trait(cx, def_id, substs.clone(), bounds)
&UnsizeVtable(TyTrait { ref principal, bounds }, _) => {
mk_trait(cx, (*principal).clone(), bounds)
}
}
}
@ -3808,7 +3812,7 @@ pub fn ty_sort_string(cx: &ctxt, t: t) -> String {
ty_bare_fn(_) => "extern fn".to_string(),
ty_closure(_) => "fn".to_string(),
ty_trait(ref inner) => {
format!("trait {}", item_path_str(cx, inner.def_id))
format!("trait {}", item_path_str(cx, inner.principal.def_id))
}
ty_struct(id, _) => {
format!("struct {}", item_path_str(cx, id))
@ -4230,11 +4234,14 @@ pub fn try_add_builtin_trait(
pub fn ty_to_def_id(ty: t) -> Option<ast::DefId> {
match get(ty).sty {
ty_trait(box TyTrait { def_id: id, .. }) |
ty_trait(ref tt) =>
Some(tt.principal.def_id),
ty_struct(id, _) |
ty_enum(id, _) |
ty_unboxed_closure(id, _, _) => Some(id),
_ => None
ty_unboxed_closure(id, _, _) =>
Some(id),
_ =>
None
}
}
@ -5213,9 +5220,9 @@ pub fn hash_crate_independent(tcx: &ctxt, t: t, svh: &Svh) -> u64 {
}
}
}
ty_trait(box TyTrait { def_id: d, bounds, .. }) => {
ty_trait(box TyTrait { ref principal, bounds }) => {
byte!(17);
did(&mut state, d);
did(&mut state, principal.def_id);
hash!(bounds);
}
ty_struct(d, _) => {
@ -5504,12 +5511,13 @@ pub fn accumulate_lifetimes_in_type(accumulator: &mut Vec<ty::Region>,
typ: t) {
walk_ty(typ, |typ| {
match get(typ).sty {
ty_rptr(region, _) => accumulator.push(region),
ty_rptr(region, _) => {
accumulator.push(region)
}
ty_trait(ref t) => {
accumulator.push_all(t.principal.substs.regions().as_slice());
}
ty_enum(_, ref substs) |
ty_trait(box TyTrait {
ref substs,
..
}) |
ty_struct(_, ref substs) => {
accum_substs(accumulator, substs);
}
@ -5538,7 +5546,8 @@ pub fn accumulate_lifetimes_in_type(accumulator: &mut Vec<ty::Region>,
ty_param(_) |
ty_infer(_) |
ty_open(_) |
ty_err => {}
ty_err => {
}
}
});

16
src/librustc/middle/ty_fold.rs
View File

@ -373,12 +373,11 @@ impl TypeFoldable for ty::UnsizeKind {
match *self {
ty::UnsizeLength(len) => ty::UnsizeLength(len),
ty::UnsizeStruct(box ref k, n) => ty::UnsizeStruct(box k.fold_with(folder), n),
ty::UnsizeVtable(ty::TyTrait{bounds, def_id, ref substs}, self_ty) => {
ty::UnsizeVtable(ty::TyTrait{ref principal, bounds}, self_ty) => {
ty::UnsizeVtable(
ty::TyTrait {
principal: principal.fold_with(folder),
bounds: bounds.fold_with(folder),
def_id: def_id,
substs: substs.fold_with(folder)
},
self_ty.fold_with(folder))
}
@ -531,15 +530,10 @@ pub fn super_fold_sty<'tcx, T: TypeFolder<'tcx>>(this: &mut T,
ty::ty_enum(tid, ref substs) => {
ty::ty_enum(tid, substs.fold_with(this))
}
ty::ty_trait(box ty::TyTrait {
def_id,
ref substs,
bounds
}) => {
ty::ty_trait(box ty::TyTrait { ref principal, bounds }) => {
ty::ty_trait(box ty::TyTrait {
def_id: def_id,
substs: substs.fold_with(this),
bounds: this.fold_existential_bounds(bounds),
principal: (*principal).fold_with(this),
bounds: bounds.fold_with(this),
})
}
ty::ty_tup(ref ts) => {

128
src/librustc/middle/typeck/astconv.rs
View File

@ -51,8 +51,6 @@
use middle::const_eval;
use middle::def;
use middle::lang_items::{FnTraitLangItem, FnMutTraitLangItem};
use middle::lang_items::{FnOnceTraitLangItem};
use middle::resolve_lifetime as rl;
use middle::subst::{FnSpace, TypeSpace, AssocSpace, SelfSpace, Subst, Substs};
use middle::subst::{VecPerParamSpace};
@ -398,6 +396,46 @@ fn ast_path_substs<'tcx,AC,RS>(
}
}
pub fn instantiate_trait_ref<'tcx,AC,RS>(this: &AC,
rscope: &RS,
ast_trait_ref: &ast::TraitRef,
self_ty: Option<ty::t>,
associated_type: Option<ty::t>)
-> Rc<ty::TraitRef>
where AC: AstConv<'tcx>,
RS: RegionScope
{
/*!
* Instantiates the path for the given trait reference, assuming that
* it's bound to a valid trait type. Returns the def_id for the defining
* trait. Fails if the type is a type other than a trait type.
*/
match lookup_def_tcx(this.tcx(),
ast_trait_ref.path.span,
ast_trait_ref.ref_id) {
def::DefTrait(trait_did) => {
let trait_ref =
Rc::new(ast_path_to_trait_ref(this,
rscope,
trait_did,
self_ty,
associated_type,
&ast_trait_ref.path,
ast_trait_ref.ref_id));
this.tcx().trait_refs.borrow_mut().insert(ast_trait_ref.ref_id,
trait_ref.clone());
trait_ref
}
_ => {
this.tcx().sess.span_fatal(
ast_trait_ref.path.span,
format!("`{}` is not a trait", ast_trait_ref.path.user_string(this.tcx()))[]);
}
}
}
pub fn ast_path_to_trait_ref<'tcx,AC,RS>(this: &AC,
rscope: &RS,
trait_def_id: ast::DefId,
@ -405,11 +443,11 @@ pub fn ast_path_to_trait_ref<'tcx,AC,RS>(this: &AC,
associated_type: Option<ty::t>,
path: &ast::Path,
binder_id: ast::NodeId)
-> Rc<ty::TraitRef>
-> ty::TraitRef
where AC: AstConv<'tcx>,
RS: RegionScope {
let trait_def = this.get_trait_def(trait_def_id);
Rc::new(ty::TraitRef {
ty::TraitRef {
def_id: trait_def_id,
substs: ast_path_substs(this,
rscope,
@ -419,7 +457,7 @@ pub fn ast_path_to_trait_ref<'tcx,AC,RS>(this: &AC,
associated_type,
path,
binder_id)
})
}
}
pub fn ast_path_to_ty<'tcx, AC: AstConv<'tcx>, RS: RegionScope>(
@ -620,41 +658,6 @@ enum PointerTy {
Uniq
}
pub fn trait_ref_for_unboxed_function<'tcx, AC: AstConv<'tcx>,
RS:RegionScope>(
this: &AC,
rscope: &RS,
kind: ast::UnboxedClosureKind,
decl: &ast::FnDecl,
self_ty: Option<ty::t>)
-> ty::TraitRef {
let lang_item = match kind {
ast::FnUnboxedClosureKind => FnTraitLangItem,
ast::FnMutUnboxedClosureKind => FnMutTraitLangItem,
ast::FnOnceUnboxedClosureKind => FnOnceTraitLangItem,
};
let trait_did = this.tcx().lang_items.require(lang_item).unwrap();
let input_types = decl.inputs
.iter()
.map(|input| {
ast_ty_to_ty(this, rscope, &*input.ty)
}).collect::<Vec<_>>();
let input_tuple = ty::mk_tup_or_nil(this.tcx(), input_types);
let output_type = ast_ty_to_ty(this, rscope, &*decl.output);
let mut substs = Substs::new_type(vec!(input_tuple, output_type),
Vec::new());
match self_ty {
Some(s) => substs.types.push(SelfSpace, s),
None => ()
}
ty::TraitRef {
def_id: trait_did,
substs: substs,
}
}
// Handle `~`, `Box`, and `&` being able to mean strs and vecs.
// If a_seq_ty is a str or a vec, make it a str/vec.
// Also handle first-class trait types.
@ -702,26 +705,17 @@ fn mk_pointer<'tcx, AC: AstConv<'tcx>, RS: RegionScope>(
None,
path,
id);
let bounds = match *opt_bounds {
None => {
conv_existential_bounds(this,
rscope,
path.span,
[result.clone()].as_slice(),
[].as_slice())
}
Some(ref bounds) => {
conv_existential_bounds(this,
rscope,
path.span,
[result.clone()].as_slice(),
bounds.as_slice())
}
};
let empty_vec = [];
let bounds = match *opt_bounds { None => empty_vec.as_slice(),
Some(ref bounds) => bounds.as_slice() };
let existential_bounds = conv_existential_bounds(this,
rscope,
path.span,
&[Rc::new(result.clone())],
bounds);
let tr = ty::mk_trait(tcx,
result.def_id,
result.substs.clone(),
bounds);
result,
existential_bounds);
return match ptr_ty {
Uniq => {
return ty::mk_uniq(tcx, tr);
@ -907,6 +901,16 @@ pub fn ast_ty_to_ty<'tcx, AC: AstConv<'tcx>, RS: RegionScope>(
ty::mk_closure(tcx, fn_decl)
}
ast::TyPolyTraitRef(ref data) => {
// FIXME(#18639) this is just a placeholder for code to come
let principal = instantiate_trait_ref(this, rscope, &data.trait_ref, None, None);
let bounds = conv_existential_bounds(this,
rscope,
ast_ty.span,
&[principal.clone()],
&[]);
ty::mk_trait(tcx, (*principal).clone(), bounds)
}
ast::TyPath(ref path, ref bounds, id) => {
let a_def = match tcx.def_map.borrow().get(&id) {
None => {
@ -943,11 +947,10 @@ pub fn ast_ty_to_ty<'tcx, AC: AstConv<'tcx>, RS: RegionScope>(
let bounds = conv_existential_bounds(this,
rscope,
ast_ty.span,
&[result.clone()],
&[Rc::new(result.clone())],
ast_bounds);
ty::mk_trait(tcx,
result.def_id,
result.substs.clone(),
result,
bounds)
}
def::DefTy(did, _) | def::DefStruct(did) => {
@ -1546,6 +1549,7 @@ pub fn partition_bounds<'a>(tcx: &ty::ctxt,
for &ast_bound in ast_bounds.iter() {
match *ast_bound {
ast::TraitTyParamBound(ref b) => {
let b = &b.trait_ref; // FIXME
match lookup_def_tcx(tcx, b.path.span, b.ref_id) {
def::DefTrait(trait_did) => {
match trait_def_ids.get(&trait_did) {

45
src/librustc/middle/typeck/check/method.rs
View File

@ -632,9 +632,9 @@ impl<'a, 'tcx> LookupContext<'a, 'tcx> {
let span = self.self_expr.map_or(self.span, |e| e.span);
check::autoderef(self.fcx, span, self_ty, None, NoPreference, |self_ty, _| {
match get(self_ty).sty {
ty_trait(box TyTrait { def_id, ref substs, bounds, .. }) => {
self.push_inherent_candidates_from_object(self_ty, def_id, substs, bounds);
self.push_inherent_impl_candidates_for_type(def_id);
ty_trait(box TyTrait { ref principal, bounds, .. }) => {
self.push_inherent_candidates_from_object(self_ty, &*principal, bounds);
self.push_inherent_impl_candidates_for_type(principal.def_id);
}
ty_enum(did, _) |
ty_struct(did, _) |
@ -744,24 +744,23 @@ impl<'a, 'tcx> LookupContext<'a, 'tcx> {
fn push_inherent_candidates_from_object(&mut self,
self_ty: ty::t,
did: DefId,
substs: &subst::Substs,
principal: &ty::TraitRef,
_bounds: ty::ExistentialBounds) {
debug!("push_inherent_candidates_from_object(self_ty={})",
self_ty.repr(self.tcx()));
let tcx = self.tcx();
// It is illegal to invoke a method on a trait instance that refers to
// the `Self` type. Here, we use a substitution that replaces `Self`
// with the object type itself. Hence, a `&self` method will wind up
// with an argument type like `&Trait`.
let rcvr_substs = substs.with_self_ty(self_ty);
let trait_ref = Rc::new(TraitRef {
def_id: did,
substs: rcvr_substs.clone()
});
// It is illegal to invoke a method on a trait instance that
// refers to the `Self` type. An error will be reported by
// `enforce_object_limitations()` if the method refers to the
// `Self` type anywhere other than the receiver. Here, we use
// a substitution that replaces `Self` with the object type
// itself. Hence, a `&self` method will wind up with an
// argument type like `&Trait`.
let rcvr_substs = principal.substs.with_self_ty(self_ty);
let trait_ref = Rc::new(TraitRef { def_id: principal.def_id,
substs: rcvr_substs.clone() });
self.push_inherent_candidates_from_bounds_inner(
&[trait_ref.clone()],
@ -796,7 +795,7 @@ impl<'a, 'tcx> LookupContext<'a, 'tcx> {
method_ty: m,
origin: MethodTraitObject(MethodObject {
trait_ref: new_trait_ref,
object_trait_id: did,
object_trait_id: principal.def_id,
method_num: method_num,
real_index: vtable_index
})
@ -1151,17 +1150,19 @@ impl<'a, 'tcx> LookupContext<'a, 'tcx> {
fn auto_slice_trait(&self, ty: ty::t, autoderefs: uint) -> Option<MethodResult> {
debug!("auto_slice_trait");
match ty::get(ty).sty {
ty_trait(box ty::TyTrait {
def_id: trt_did,
substs: ref trt_substs,
bounds: b,
.. }) => {
ty_trait(box ty::TyTrait { ref principal,
bounds: b,
.. }) => {
let trt_did = principal.def_id;
let trt_substs = &principal.substs;
let tcx = self.tcx();
self.search_for_some_kind_of_autorefd_method(
|r, m| AutoPtr(r, m, None),
autoderefs, [MutImmutable, MutMutable],
|m, r| {
let tr = ty::mk_trait(tcx, trt_did, trt_substs.clone(), b);
let principal = ty::TraitRef::new(trt_did,
trt_substs.clone());
let tr = ty::mk_trait(tcx, principal, b);
ty::mk_rptr(tcx, r, ty::mt{ ty: tr, mutbl: m })
})
}

13
src/librustc/middle/typeck/check/vtable.rs
View File

@ -140,11 +140,11 @@ pub fn check_object_safety(tcx: &ty::ctxt, object_trait: &ty::TyTrait, span: Spa
// `call_once` which is the method which takes self by value. What could go
// wrong?
match tcx.lang_items.fn_once_trait() {
Some(def_id) if def_id == object_trait.def_id => return,
Some(def_id) if def_id == object_trait.principal.def_id => return,
_ => {}
}
let trait_items = ty::trait_items(tcx, object_trait.def_id);
let trait_items = ty::trait_items(tcx, object_trait.principal.def_id);
let mut errors = Vec::new();
for item in trait_items.iter() {
@ -158,7 +158,7 @@ pub fn check_object_safety(tcx: &ty::ctxt, object_trait: &ty::TyTrait, span: Spa
let mut errors = errors.iter().flat_map(|x| x.iter()).peekable();
if errors.peek().is_some() {
let trait_name = ty::item_path_str(tcx, object_trait.def_id);
let trait_name = ty::item_path_str(tcx, object_trait.principal.def_id);
span_err!(tcx.sess, span, E0038,
"cannot convert to a trait object because trait `{}` is not object-safe",
trait_name);
@ -241,8 +241,7 @@ pub fn register_object_cast_obligations(fcx: &FnCtxt,
// needs some refactoring so there is a more convenient type to pass around.
let object_trait_ty =
ty::mk_trait(fcx.tcx(),
object_trait.def_id,
object_trait.substs.clone(),
object_trait.principal.clone(),
object_trait.bounds);
debug!("register_object_cast_obligations: referent_ty={} object_trait_ty={}",
@ -252,13 +251,13 @@ pub fn register_object_cast_obligations(fcx: &FnCtxt,
// Take the type parameters from the object type, but set
// the Self type (which is unknown, for the object type)
// to be the type we are casting from.
let mut object_substs = object_trait.substs.clone();
let mut object_substs = object_trait.principal.substs.clone();
assert!(object_substs.self_ty().is_none());
object_substs.types.push(SelfSpace, referent_ty);
// Create the obligation for casting from T to Trait.
let object_trait_ref =
Rc::new(ty::TraitRef { def_id: object_trait.def_id,
Rc::new(ty::TraitRef { def_id: object_trait.principal.def_id,
substs: object_substs });
let object_obligation =
Obligation::new(

8
src/librustc/middle/typeck/coherence/mod.rs
View File

@ -112,8 +112,8 @@ fn get_base_type_def_id(inference_context: &InferCtxt,
ty_rptr(_, ty::mt {ty, ..}) |
ty_uniq(ty) => {
match ty::get(ty).sty {
ty_trait(box ty::TyTrait { def_id, .. }) => {
Some(def_id)
ty_trait(box ty::TyTrait { ref principal, .. }) => {
Some(principal.def_id)
}
_ => {
panic!("get_base_type() returned a type that wasn't an \
@ -121,8 +121,8 @@ fn get_base_type_def_id(inference_context: &InferCtxt,
}
}
}
ty_trait(box ty::TyTrait { def_id, .. }) => {
Some(def_id)
ty_trait(box ty::TyTrait { ref principal, .. }) => {
Some(principal.def_id)
}
_ => {
panic!("get_base_type() returned a type that wasn't an \

25
src/librustc/middle/typeck/coherence/orphan.rs
View File

@ -18,6 +18,7 @@ use middle::ty;
use syntax::ast::{Item, ItemImpl};
use syntax::ast;
use syntax::ast_util;
use syntax::codemap::Span;
use syntax::visit;
use util::ppaux::Repr;
@ -30,6 +31,17 @@ struct OrphanChecker<'cx, 'tcx:'cx> {
tcx: &'cx ty::ctxt<'tcx>
}
impl<'cx, 'tcx> OrphanChecker<'cx, 'tcx> {
fn check_def_id(&self, span: Span, def_id: ast::DefId) {
if def_id.krate != ast::LOCAL_CRATE {
span_err!(self.tcx.sess, span, E0116,
"cannot associate methods with a type outside the \
crate the type is defined in; define and implement \
a trait or new type instead");
}
}
}
impl<'cx, 'tcx,'v> visit::Visitor<'v> for OrphanChecker<'cx, 'tcx> {
fn visit_item(&mut self, item: &'v ast::Item) {
let def_id = ast_util::local_def(item.id);
@ -41,14 +53,11 @@ impl<'cx, 'tcx,'v> visit::Visitor<'v> for OrphanChecker<'cx, 'tcx> {
let self_ty = ty::lookup_item_type(self.tcx, def_id).ty;
match ty::get(self_ty).sty {
ty::ty_enum(def_id, _) |
ty::ty_struct(def_id, _) |
ty::ty_trait(box ty::TyTrait{ def_id, ..}) => {
if def_id.krate != ast::LOCAL_CRATE {
span_err!(self.tcx.sess, item.span, E0116,
"cannot associate methods with a type outside the \
crate the type is defined in; define and implement \
a trait or new type instead");
}
ty::ty_struct(def_id, _) => {
self.check_def_id(item.span, def_id);
}
ty::ty_trait(box ty::TyTrait{ ref principal, ..}) => {
self.check_def_id(item.span, principal.def_id);
}
_ => {
span_err!(self.tcx.sess, item.span, E0118,

99
src/librustc/middle/typeck/collect.rs
View File

@ -61,7 +61,6 @@ use syntax::ast_util::{local_def, PostExpansionMethod};
use syntax::codemap::Span;
use syntax::parse::token::{special_idents};
use syntax::parse::token;
use syntax::print::pprust::{path_to_string};
use syntax::ptr::P;
use syntax::visit;
@ -633,24 +632,33 @@ pub fn ensure_no_ty_param_bounds(ccx: &CrateCtxt,
span: Span,
generics: &ast::Generics,
thing: &'static str) {
let mut warn = false;
for ty_param in generics.ty_params.iter() {
let bounds = ty_param.bounds.iter();
let mut bounds = bounds.chain(ty_param.unbound.iter());
for bound in bounds {
for bound in ty_param.bounds.iter() {
match *bound {
ast::TraitTyParamBound(..) => {
// According to accepted RFC #XXX, we should
// eventually accept these, but it will not be
// part of this PR. Still, convert to warning to
// make bootstrapping easier.
span_warn!(ccx.tcx.sess, span, E0122,
"trait bounds are not (yet) enforced \
in {} definitions",
thing);
warn = true;
}
ast::RegionTyParamBound(..) => { }
}
}
match ty_param.unbound {
Some(_) => { warn = true; }
None => { }
}
}
if warn {
// According to accepted RFC #XXX, we should
// eventually accept these, but it will not be
// part of this PR. Still, convert to warning to
// make bootstrapping easier.
span_warn!(ccx.tcx.sess, span, E0122,
"trait bounds are not (yet) enforced \
in {} definitions",
thing);
}
}
@ -1147,7 +1155,8 @@ pub fn convert(ccx: &CrateCtxt, it: &ast::Item) {
parent_visibility);
for trait_ref in opt_trait_ref.iter() {
instantiate_trait_ref(&icx, trait_ref, selfty, None);
astconv::instantiate_trait_ref(&icx, &ExplicitRscope, trait_ref,
Some(selfty), None);
}
},
ast::ItemTrait(_, _, _, ref trait_methods) => {
@ -1315,47 +1324,6 @@ pub fn convert_foreign(ccx: &CrateCtxt, i: &ast::ForeignItem) {
ccx.tcx.tcache.borrow_mut().insert(local_def(i.id), pty);
}
pub fn instantiate_trait_ref<'tcx,AC>(this: &AC,
ast_trait_ref: &ast::TraitRef,
self_ty: ty::t,
associated_type: Option<ty::t>)
-> Rc<ty::TraitRef>
where AC: AstConv<'tcx> {
/*!
* Instantiates the path for the given trait reference, assuming that
* it's bound to a valid trait type. Returns the def_id for the defining
* trait. Fails if the type is a type other than a trait type.
*/
// FIXME(#5121) -- distinguish early vs late lifetime params
let rscope = ExplicitRscope;
match lookup_def_tcx(this.tcx(),
ast_trait_ref.path.span,
ast_trait_ref.ref_id) {
def::DefTrait(trait_did) => {
let trait_ref =
astconv::ast_path_to_trait_ref(this,
&rscope,
trait_did,
Some(self_ty),
associated_type,
&ast_trait_ref.path,
ast_trait_ref.ref_id);
this.tcx().trait_refs.borrow_mut().insert(ast_trait_ref.ref_id,
trait_ref.clone());
trait_ref
}
_ => {
this.tcx().sess.span_fatal(
ast_trait_ref.path.span,
format!("`{}` is not a trait",
path_to_string(&ast_trait_ref.path)).as_slice());
}
}
}
fn get_trait_def(ccx: &CrateCtxt, trait_id: ast::DefId) -> Rc<ty::TraitDef> {
if trait_id.krate != ast::LOCAL_CRATE {
return ty::lookup_trait_def(ccx.tcx, trait_id)
@ -1720,14 +1688,14 @@ fn ty_generics_for_fn_or_method<'tcx,AC>(
// Add the Sized bound, unless the type parameter is marked as `Sized?`.
fn add_unsized_bound<'tcx,AC>(this: &AC,
unbound: &Option<ast::TyParamBound>,
unbound: &Option<ast::TraitRef>,
bounds: &mut ty::BuiltinBounds,
desc: &str,
span: Span)
where AC: AstConv<'tcx> {
let kind_id = this.tcx().lang_items.require(SizedTraitLangItem);
match unbound {
&Some(ast::TraitTyParamBound(ref tpb)) => {
&Some(ref tpb) => {
// FIXME(#8559) currently requires the unbound to be built-in.
let trait_def_id = ty::trait_ref_to_def_id(this.tcx(), tpb);
match kind_id {
@ -1752,7 +1720,7 @@ fn add_unsized_bound<'tcx,AC>(this: &AC,
ty::try_add_builtin_trait(this.tcx(), kind_id.unwrap(), bounds);
}
// No lang item for Sized, so we can't add it as a bound.
_ => {}
&None => {}
}
}
@ -1870,11 +1838,11 @@ fn ty_generics<'tcx,AC>(this: &AC,
let trait_def_id =
match lookup_def_tcx(this.tcx(),
ast_trait_ref.path.span,
ast_trait_ref.ref_id) {
ast_trait_ref.trait_ref.path.span,
ast_trait_ref.trait_ref.ref_id) {
def::DefTrait(trait_def_id) => trait_def_id,
_ => {
this.tcx().sess.span_bug(ast_trait_ref.path.span,
this.tcx().sess.span_bug(ast_trait_ref.trait_ref.path.span,
"not a trait?!")
}
};
@ -1972,7 +1940,7 @@ fn compute_bounds<'tcx,AC>(this: &AC,
name_of_bounded_thing: ast::Name,
param_ty: ty::ParamTy,
ast_bounds: &[ast::TyParamBound],
unbound: &Option<ast::TyParamBound>,
unbound: &Option<ast::TraitRef>,
span: Span,
where_clause: &ast::WhereClause)
-> ty::ParamBounds
@ -2047,10 +2015,11 @@ fn conv_param_bounds<'tcx,AC>(this: &AC,
let trait_bounds: Vec<Rc<ty::TraitRef>> =
trait_bounds.into_iter()
.map(|b| {
instantiate_trait_ref(this,
b,
param_ty.to_ty(this.tcx()),
Some(param_ty.to_ty(this.tcx())))
astconv::instantiate_trait_ref(this,
&ExplicitRscope,
b,
Some(param_ty.to_ty(this.tcx())),
Some(param_ty.to_ty(this.tcx())))
})
.collect();
let region_bounds: Vec<ty::Region> =

29
src/librustc/middle/typeck/infer/coercion.rs
View File

@ -413,15 +413,14 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
let ty = ty::mk_vec(tcx, t_a, None);
Some((ty, ty::UnsizeLength(len)))
}
(&ty::ty_trait(..), &ty::ty_trait(..)) => None,
(_, &ty::ty_trait(box ty::TyTrait { def_id, ref substs, bounds })) => {
let ty = ty::mk_trait(tcx,
def_id,
substs.clone(),
bounds);
Some((ty, ty::UnsizeVtable(ty::TyTrait { def_id: def_id,
bounds: bounds,
substs: substs.clone() },
(&ty::ty_trait(..), &ty::ty_trait(..)) => {
None
}
(_, &ty::ty_trait(box ty::TyTrait { ref principal, bounds })) => {
// FIXME what is the purpose of `ty`?
let ty = ty::mk_trait(tcx, (*principal).clone(), bounds);
Some((ty, ty::UnsizeVtable(ty::TyTrait { principal: (*principal).clone(),
bounds: bounds },
ty_a)))
}
(&ty::ty_struct(did_a, ref substs_a), &ty::ty_struct(did_b, ref substs_b))
@ -524,16 +523,10 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
match *sty_a {
ty::ty_rptr(_, ty::mt{ty, mutbl}) => match ty::get(ty).sty {
ty::ty_trait(box ty::TyTrait {
def_id,
ref substs,
bounds,
..
}) =>
{
ty::ty_trait(box ty::TyTrait { ref principal, bounds }) => {
debug!("mutbl={} b_mutbl={}", mutbl, b_mutbl);
let tr = ty::mk_trait(tcx, def_id, substs.clone(), bounds);
// FIXME what is purpose of this type `tr`?
let tr = ty::mk_trait(tcx, (*principal).clone(), bounds);
try!(self.subtype(mk_ty(tr), b));
Ok(Some(AdjustDerefRef(AutoDerefRef {
autoderefs: 1,

11
src/librustc/middle/typeck/infer/combine.rs
View File

@ -52,7 +52,6 @@ use middle::typeck::infer::type_variable::{RelationDir, EqTo,
use middle::ty_fold::{TypeFoldable};
use util::ppaux::Repr;
use syntax::ast::{Onceness, FnStyle};
use syntax::ast;
use syntax::abi;
@ -461,15 +460,11 @@ pub fn super_tys<'tcx, C: Combine<'tcx>>(this: &C, a: ty::t, b: ty::t) -> cres<t
}
(&ty::ty_trait(ref a_),
&ty::ty_trait(ref b_))
if a_.def_id == b_.def_id => {
&ty::ty_trait(ref b_)) => {
debug!("Trying to match traits {} and {}", a, b);
let substs = try!(this.substs(a_.def_id, &a_.substs, &b_.substs));
let principal = try!(this.trait_refs(&a_.principal, &b_.principal));
let bounds = try!(this.existential_bounds(a_.bounds, b_.bounds));
Ok(ty::mk_trait(tcx,
a_.def_id,
substs.clone(),
bounds))
Ok(ty::mk_trait(tcx, principal, bounds))
}
(&ty::ty_struct(a_id, ref a_substs), &ty::ty_struct(b_id, ref b_substs))

13
src/librustc/middle/typeck/infer/error_reporting.rs
View File

@ -1102,7 +1102,8 @@ impl<'a, 'tcx> Rebuilder<'a, 'tcx> {
// be passing down a map.
ast::RegionTyParamBound(lt)
}
&ast::TraitTyParamBound(ref tr) => {
&ast::TraitTyParamBound(ref poly_tr) => {
let tr = &poly_tr.trait_ref;
let last_seg = tr.path.segments.last().unwrap();
let mut insert = Vec::new();
let lifetimes = last_seg.parameters.lifetimes();
@ -1119,10 +1120,12 @@ impl<'a, 'tcx> Rebuilder<'a, 'tcx> {
region_names: region_names
};
let new_path = self.rebuild_path(rebuild_info, lifetime);
ast::TraitTyParamBound(ast::TraitRef {
path: new_path,
ref_id: tr.ref_id,
lifetimes: tr.lifetimes.clone(),
ast::TraitTyParamBound(ast::PolyTraitRef {
bound_lifetimes: poly_tr.bound_lifetimes.clone(),
trait_ref: ast::TraitRef {
path: new_path,
ref_id: tr.ref_id,
}
})
}
}

10
src/librustc/middle/typeck/infer/mod.rs
View File

@ -856,16 +856,12 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
-> ty::TraitRef {
// make up a dummy type just to reuse/abuse the resolve machinery
let dummy0 = ty::mk_trait(self.tcx,
trait_ref.def_id,
trait_ref.substs.clone(),
(*trait_ref).clone(),
ty::region_existential_bound(ty::ReStatic));
let dummy1 = self.resolve_type_vars_if_possible(dummy0);
match ty::get(dummy1).sty {
ty::ty_trait(box ty::TyTrait { ref def_id, ref substs, .. }) => {
ty::TraitRef {
def_id: *def_id,
substs: (*substs).clone(),
}
ty::ty_trait(box ty::TyTrait { ref principal, .. }) => {
(*principal).clone()
}
_ => {
self.tcx.sess.bug(

10
src/librustc/middle/typeck/variance.rs
View File

@ -778,14 +778,14 @@ impl<'a, 'tcx> ConstraintContext<'a, 'tcx> {
variance);
}
ty::ty_trait(box ty::TyTrait { def_id, ref substs, bounds }) => {
let trait_def = ty::lookup_trait_def(self.tcx(), def_id);
ty::ty_trait(box ty::TyTrait { ref principal, bounds }) => {
let trait_def = ty::lookup_trait_def(self.tcx(), principal.def_id);
let generics = &trait_def.generics;
// Traits DO have a Self type parameter, but it is
// erased from object types.
assert!(!generics.types.is_empty_in(subst::SelfSpace) &&
substs.types.is_empty_in(subst::SelfSpace));
principal.substs.types.is_empty_in(subst::SelfSpace));
// Traits never declare region parameters in the self
// space.
@ -801,10 +801,10 @@ impl<'a, 'tcx> ConstraintContext<'a, 'tcx> {
self.add_constraints_from_region(bounds.region_bound, contra);
self.add_constraints_from_substs(
def_id,
principal.def_id,
generics.types.get_slice(subst::TypeSpace),
generics.regions.get_slice(subst::TypeSpace),
substs,
&principal.substs,
variance);
}

8
src/librustc/util/ppaux.rs
View File

@ -435,12 +435,12 @@ pub fn ty_to_string(cx: &ctxt, typ: t) -> String {
parameterized(cx, base.as_slice(), substs, &generics)
}
ty_trait(box ty::TyTrait {
def_id: did, ref substs, ref bounds
ref principal, ref bounds
}) => {
let base = ty::item_path_str(cx, did);
let trait_def = ty::lookup_trait_def(cx, did);
let base = ty::item_path_str(cx, principal.def_id);
let trait_def = ty::lookup_trait_def(cx, principal.def_id);
let ty = parameterized(cx, base.as_slice(),
substs, &trait_def.generics);
&principal.substs, &trait_def.generics);
let bound_str = bounds.user_string(cx);
let bound_sep = if bound_str.is_empty() { "" } else { "+" };
format!("{}{}{}",

9
src/librustdoc/clean/mod.rs
View File

@ -963,6 +963,12 @@ impl Clean<Type> for ast::TraitRef {
}
}
impl Clean<Type> for ast::PolyTraitRef {
fn clean(&self, cx: &DocContext) -> Type {
self.trait_ref.clean(cx)
}
}
#[deriving(Clone, Encodable, Decodable)]
pub enum TraitMethod {
RequiredMethod(Item),
@ -1306,7 +1312,8 @@ impl Clean<Type> for ty::t {
}
ty::ty_struct(did, ref substs) |
ty::ty_enum(did, ref substs) |
ty::ty_trait(box ty::TyTrait { def_id: did, ref substs, .. }) => {
ty::ty_trait(box ty::TyTrait { principal: ty::TraitRef { def_id: did, ref substs },
.. }) => {
let fqn = csearch::get_item_path(cx.tcx(), did);
let fqn: Vec<String> = fqn.into_iter().map(|i| {
i.to_string()

20
src/libsyntax/ast.rs
View File

@ -307,7 +307,7 @@ pub const DUMMY_NODE_ID: NodeId = -1;
/// detects Copy, Send and Sync.
#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
pub enum TyParamBound {
TraitTyParamBound(TraitRef),
TraitTyParamBound(PolyTraitRef),
RegionTyParamBound(Lifetime)
}
@ -318,7 +318,7 @@ pub struct TyParam {
pub ident: Ident,
pub id: NodeId,
pub bounds: TyParamBounds,
pub unbound: Option<TyParamBound>,
pub unbound: Option<TraitRef>,
pub default: Option<P<Ty>>,
pub span: Span
}
@ -1097,6 +1097,7 @@ pub enum Ty_ {
TyBareFn(P<BareFnTy>),
TyTup(Vec<P<Ty>> ),
TyPath(Path, Option<TyParamBounds>, NodeId), // for #7264; see above
TyPolyTraitRef(P<PolyTraitRef>), // a type like `for<'a> Foo<&'a Bar>`
/// A "qualified path", e.g. `<Vec<T> as SomeTrait>::SomeType`
TyQPath(P<QPath>),
/// No-op; kept solely so that we can pretty-print faithfully
@ -1350,7 +1351,6 @@ pub struct Attribute_ {
pub is_sugared_doc: bool,
}
/// TraitRef's appear in impls.
/// resolve maps each TraitRef's ref_id to its defining trait; that's all
/// that the ref_id is for. The impl_id maps to the "self type" of this impl.
@ -1360,7 +1360,15 @@ pub struct Attribute_ {
pub struct TraitRef {
pub path: Path,
pub ref_id: NodeId,
pub lifetimes: Vec<LifetimeDef>,
}
#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
pub struct PolyTraitRef {
/// The `'a` in `<'a> Foo<&'a T>`
pub bound_lifetimes: Vec<LifetimeDef>,
/// The `Foo<&'a T>` in `<'a> Foo<&'a T>`
pub trait_ref: TraitRef
}
#[deriving(Clone, PartialEq, Eq, Encodable, Decodable, Hash, Show)]
@ -1448,8 +1456,8 @@ pub enum Item_ {
ItemStruct(P<StructDef>, Generics),
/// Represents a Trait Declaration
ItemTrait(Generics,
Option<TyParamBound>, // (optional) default bound not required for Self.
// Currently, only Sized makes sense here.
Option<TraitRef>, // (optional) default bound not required for Self.
// Currently, only Sized makes sense here.
TyParamBounds,
Vec<TraitItem>),
ItemImpl(Generics,

2
src/libsyntax/ast_map/mod.rs
View File

@ -770,7 +770,7 @@ impl<'ast> Visitor<'ast> for NodeCollector<'ast> {
for b in bounds.iter() {
match *b {
TraitTyParamBound(ref t) => {
self.insert(t.ref_id, NodeItem(i));
self.insert(t.trait_ref.ref_id, NodeItem(i));
}
_ => {}
}

15
src/libsyntax/ext/build.rs
View File

@ -68,10 +68,11 @@ pub trait AstBuilder {
span: Span,
id: ast::Ident,
bounds: OwnedSlice<ast::TyParamBound>,
unbound: Option<ast::TyParamBound>,
unbound: Option<ast::TraitRef>,
default: Option<P<ast::Ty>>) -> ast::TyParam;
fn trait_ref(&self, path: ast::Path) -> ast::TraitRef;
fn poly_trait_ref(&self, path: ast::Path) -> ast::PolyTraitRef;
fn typarambound(&self, path: ast::Path) -> ast::TyParamBound;
fn lifetime(&self, span: Span, ident: ast::Name) -> ast::Lifetime;
fn lifetime_def(&self,
@ -417,7 +418,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
span: Span,
id: ast::Ident,
bounds: OwnedSlice<ast::TyParamBound>,
unbound: Option<ast::TyParamBound>,
unbound: Option<ast::TraitRef>,
default: Option<P<ast::Ty>>) -> ast::TyParam {
ast::TyParam {
ident: id,
@ -445,12 +446,18 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
ast::TraitRef {
path: path,
ref_id: ast::DUMMY_NODE_ID,
lifetimes: Vec::new(),
}
}
fn poly_trait_ref(&self, path: ast::Path) -> ast::PolyTraitRef {
ast::PolyTraitRef {
bound_lifetimes: Vec::new(),
trait_ref: self.trait_ref(path)
}
}
fn typarambound(&self, path: ast::Path) -> ast::TyParamBound {
ast::TraitTyParamBound(self.trait_ref(path))
ast::TraitTyParamBound(self.poly_trait_ref(path))
}
fn lifetime(&self, span: Span, name: ast::Name) -> ast::Lifetime {

4
src/libsyntax/ext/deriving/generic/ty.rs
View File

@ -194,7 +194,7 @@ impl<'a> Ty<'a> {
fn mk_ty_param(cx: &ExtCtxt, span: Span, name: &str,
bounds: &[Path], unbound: Option<ast::TyParamBound>,
bounds: &[Path], unbound: Option<ast::TraitRef>,
self_ident: Ident, self_generics: &Generics) -> ast::TyParam {
let bounds =
bounds.iter().map(|b| {
@ -220,7 +220,7 @@ fn mk_generics(lifetimes: Vec<ast::LifetimeDef>, ty_params: Vec<ast::TyParam>)
#[deriving(Clone)]
pub struct LifetimeBounds<'a> {
pub lifetimes: Vec<(&'a str, Vec<&'a str>)>,
pub bounds: Vec<(&'a str, Option<ast::TyParamBound>, Vec<Path<'a>>)>,
pub bounds: Vec<(&'a str, Option<ast::TraitRef>, Vec<Path<'a>>)>,
}
impl<'a> LifetimeBounds<'a> {

10
src/libsyntax/feature_gate.rs
View File

@ -38,7 +38,6 @@ static KNOWN_FEATURES: &'static [(&'static str, Status)] = &[
("globs", Active),
("macro_rules", Active),
("struct_variant", Active),
("once_fns", Active),
("asm", Active),
("managed_boxes", Removed),
("non_ascii_idents", Active),
@ -307,11 +306,10 @@ impl<'a, 'v> Visitor<'v> for Context<'a> {
fn visit_ty(&mut self, t: &ast::Ty) {
match t.node {
ast::TyClosure(ref closure) if closure.onceness == ast::Once => {
self.gate_feature("once_fns", t.span,
"once functions are \
experimental and likely to be removed");
ast::TyClosure(ref closure) => {
// this used to be blocked by a feature gate, but it should just
// be plain impossible right now
assert!(closure.onceness != ast::Once);
},
_ => {}
}

24
src/libsyntax/fold.rs
View File

@ -227,6 +227,10 @@ pub trait Folder {
noop_fold_trait_ref(p, self)
}
fn fold_poly_trait_ref(&mut self, p: PolyTraitRef) -> PolyTraitRef {
noop_fold_poly_trait_ref(p, self)
}
fn fold_struct_def(&mut self, struct_def: P<StructDef>) -> P<StructDef> {
noop_fold_struct_def(struct_def, self)
}
@ -442,7 +446,10 @@ pub fn noop_fold_ty<T: Folder>(t: P<Ty>, fld: &mut T) -> P<Ty> {
TyFixedLengthVec(ty, e) => {
TyFixedLengthVec(fld.fold_ty(ty), fld.fold_expr(e))
}
TyTypeof(expr) => TyTypeof(fld.fold_expr(expr))
TyTypeof(expr) => TyTypeof(fld.fold_expr(expr)),
TyPolyTraitRef(poly_trait_ref) => {
TyPolyTraitRef(poly_trait_ref.map(|p| fld.fold_poly_trait_ref(p)))
},
},
span: fld.new_span(span)
})
@ -711,7 +718,7 @@ pub fn noop_fold_ty_param_bound<T>(tpb: TyParamBound, fld: &mut T)
-> TyParamBound
where T: Folder {
match tpb {
TraitTyParamBound(ty) => TraitTyParamBound(fld.fold_trait_ref(ty)),
TraitTyParamBound(ty) => TraitTyParamBound(fld.fold_poly_trait_ref(ty)),
RegionTyParamBound(lifetime) => RegionTyParamBound(fld.fold_lifetime(lifetime)),
}
}
@ -722,7 +729,7 @@ pub fn noop_fold_ty_param<T: Folder>(tp: TyParam, fld: &mut T) -> TyParam {
id: fld.new_id(id),
ident: ident,
bounds: fld.fold_bounds(bounds),
unbound: unbound.map(|x| fld.fold_ty_param_bound(x)),
unbound: unbound.map(|x| fld.fold_trait_ref(x)),
default: default.map(|x| fld.fold_ty(x)),
span: span
}
@ -842,13 +849,18 @@ pub fn noop_fold_trait_ref<T: Folder>(p: TraitRef, fld: &mut T) -> TraitRef {
let id = fld.new_id(p.ref_id);
let TraitRef {
path,
lifetimes,
..
ref_id: _,
} = p;
ast::TraitRef {
path: fld.fold_path(path),
ref_id: id,
lifetimes: fld.fold_lifetime_defs(lifetimes),
}
}
pub fn noop_fold_poly_trait_ref<T: Folder>(p: PolyTraitRef, fld: &mut T) -> PolyTraitRef {
ast::PolyTraitRef {
bound_lifetimes: fld.fold_lifetime_defs(p.bound_lifetimes),
trait_ref: fld.fold_trait_ref(p.trait_ref)
}
}

310
src/libsyntax/parse/parser.rs
View File

@ -42,6 +42,7 @@ use ast::{Method, MutTy, BiMul, Mutability};
use ast::{MethodImplItem, NamedField, UnNeg, NoReturn, UnNot};
use ast::{Pat, PatEnum, PatIdent, PatLit, PatRange, PatRegion, PatStruct};
use ast::{PatTup, PatBox, PatWild, PatWildMulti, PatWildSingle};
use ast::{PolyTraitRef};
use ast::{QPath, RequiredMethod};
use ast::{RetStyle, Return, BiShl, BiShr, Stmt, StmtDecl};
use ast::{StmtExpr, StmtSemi, StmtMac, StructDef, StructField};
@ -53,7 +54,7 @@ use ast::{TtDelimited, TtSequence, TtToken};
use ast::{TupleVariantKind, Ty, Ty_, TyBot};
use ast::{TypeField, TyFixedLengthVec, TyClosure, TyProc, TyBareFn};
use ast::{TyTypeof, TyInfer, TypeMethod};
use ast::{TyNil, TyParam, TyParamBound, TyParen, TyPath, TyPtr, TyQPath};
use ast::{TyNil, TyParam, TyParamBound, TyParen, TyPath, TyPolyTraitRef, TyPtr, TyQPath};
use ast::{TyRptr, TyTup, TyU32, TyUniq, TyVec, UnUniq};
use ast::{TypeImplItem, TypeTraitItem, Typedef, UnboxedClosureKind};
use ast::{UnnamedField, UnsafeBlock};
@ -968,30 +969,14 @@ impl<'a> Parser<'a> {
/// Is the current token one of the keywords that signals a bare function
/// type?
pub fn token_is_bare_fn_keyword(&mut self) -> bool {
if self.token.is_keyword(keywords::Fn) {
return true
}
if self.token.is_keyword(keywords::Unsafe) ||
self.token.is_keyword(keywords::Once) {
return self.look_ahead(1, |t| t.is_keyword(keywords::Fn))
}
false
self.token.is_keyword(keywords::Fn) ||
self.token.is_keyword(keywords::Unsafe) ||
self.token.is_keyword(keywords::Extern)
}
/// Is the current token one of the keywords that signals a closure type?
pub fn token_is_closure_keyword(&mut self) -> bool {
self.token.is_keyword(keywords::Unsafe) ||
self.token.is_keyword(keywords::Once)
}
/// Is the current token one of the keywords that signals an old-style
/// closure type (with explicit sigil)?
pub fn token_is_old_style_closure_keyword(&mut self) -> bool {
self.token.is_keyword(keywords::Unsafe) ||
self.token.is_keyword(keywords::Once) ||
self.token.is_keyword(keywords::Fn)
self.token.is_keyword(keywords::Unsafe)
}
pub fn get_lifetime(&mut self) -> ast::Ident {
@ -1001,8 +986,57 @@ impl<'a> Parser<'a> {
}
}
pub fn parse_for_in_type(&mut self) -> Ty_ {
/*
Parses whatever can come after a `for` keyword in a type.
The `for` has already been consumed.
Deprecated:
- for <'lt> |S| -> T
- for <'lt> proc(S) -> T
Eventually:
- for <'lt> [unsafe] [extern "ABI"] fn (S) -> T
- for <'lt> path::foo(a, b)
*/
// parse <'lt>
let lifetime_defs = self.parse_late_bound_lifetime_defs();
// examine next token to decide to do
if self.eat_keyword(keywords::Proc) {
self.parse_proc_type(lifetime_defs)
} else if self.token_is_bare_fn_keyword() || self.token_is_closure_keyword() {
self.parse_ty_bare_fn_or_ty_closure(lifetime_defs)
} else if self.token == token::ModSep ||
self.token.is_ident() ||
self.token.is_path() {
let trait_ref = self.parse_trait_ref();
TyPolyTraitRef(P(PolyTraitRef { bound_lifetimes: lifetime_defs,
trait_ref: trait_ref }))
} else {
self.parse_ty_closure(lifetime_defs)
}
}
pub fn parse_ty_path(&mut self, plus_allowed: bool) -> Ty_ {
let mode = if plus_allowed {
LifetimeAndTypesAndBounds
} else {
LifetimeAndTypesWithoutColons
};
let PathAndBounds {
path,
bounds
} = self.parse_path(mode);
TyPath(path, bounds, ast::DUMMY_NODE_ID)
}
/// parse a TyBareFn type:
pub fn parse_ty_bare_fn(&mut self) -> Ty_ {
pub fn parse_ty_bare_fn(&mut self, lifetime_defs: Vec<ast::LifetimeDef>) -> Ty_ {
/*
[unsafe] [extern "ABI"] fn <'lt> (S) -> T
@ -1023,18 +1057,26 @@ impl<'a> Parser<'a> {
};
self.expect_keyword(keywords::Fn);
let (decl, lifetimes) = self.parse_ty_fn_decl(true);
let lifetime_defs = self.parse_legacy_lifetime_defs(lifetime_defs);
let (inputs, variadic) = self.parse_fn_args(false, true);
let (ret_style, ret_ty) = self.parse_ret_ty();
let decl = P(FnDecl {
inputs: inputs,
output: ret_ty,
cf: ret_style,
variadic: variadic
});
TyBareFn(P(BareFnTy {
abi: abi,
fn_style: fn_style,
lifetimes: lifetimes,
lifetimes: lifetime_defs,
decl: decl
}))
}
/// Parses a procedure type (`proc`). The initial `proc` keyword must
/// already have been parsed.
pub fn parse_proc_type(&mut self) -> Ty_ {
pub fn parse_proc_type(&mut self, lifetime_defs: Vec<ast::LifetimeDef>) -> Ty_ {
/*
proc <'lt> (S) [:Bounds] -> T
@ -1043,19 +1085,12 @@ impl<'a> Parser<'a> {
| | | | Return type
| | | Bounds
| | Argument types
| Lifetimes
| Legacy lifetimes
the `proc` keyword
*/
let lifetime_defs = if self.eat(&token::Lt) {
let lifetime_defs = self.parse_lifetime_defs();
self.expect_gt();
lifetime_defs
} else {
Vec::new()
};
let lifetime_defs = self.parse_legacy_lifetime_defs(lifetime_defs);
let (inputs, variadic) = self.parse_fn_args(false, false);
let bounds = self.parse_colon_then_ty_param_bounds();
let (ret_style, ret_ty) = self.parse_ret_ty();
@ -1100,33 +1135,49 @@ impl<'a> Parser<'a> {
return None
}
pub fn parse_ty_bare_fn_or_ty_closure(&mut self, lifetime_defs: Vec<LifetimeDef>) -> Ty_ {
// Both bare fns and closures can begin with stuff like unsafe
// and extern. So we just scan ahead a few tokens to see if we see
// a `fn`.
//
// Closure: [unsafe] <'lt> |S| [:Bounds] -> T
// Fn: [unsafe] [extern "ABI"] fn <'lt> (S) -> T
if self.token.is_keyword(keywords::Fn) {
self.parse_ty_bare_fn(lifetime_defs)
} else if self.token.is_keyword(keywords::Extern) {
self.parse_ty_bare_fn(lifetime_defs)
} else if self.token.is_keyword(keywords::Unsafe) {
if self.look_ahead(1, |t| t.is_keyword(keywords::Fn) ||
t.is_keyword(keywords::Extern)) {
self.parse_ty_bare_fn(lifetime_defs)
} else {
self.parse_ty_closure(lifetime_defs)
}
} else {
self.parse_ty_closure(lifetime_defs)
}
}
/// Parse a TyClosure type
pub fn parse_ty_closure(&mut self) -> Ty_ {
pub fn parse_ty_closure(&mut self, lifetime_defs: Vec<ast::LifetimeDef>) -> Ty_ {
/*
[unsafe] [once] <'lt> |S| [:Bounds] -> T
^~~~~~~^ ^~~~~^ ^~~~^ ^ ^~~~~~~~^ ^
| | | | | |
| | | | | Return type
| | | | Closure bounds
| | | Argument types
| | Lifetime defs
| Once-ness (a.k.a., affine)
[unsafe] <'lt> |S| [:Bounds] -> T
^~~~~~~^ ^~~~^ ^ ^~~~~~~~^ ^
| | | | |
| | | | Return type
| | | Closure bounds
| | Argument types
| Deprecated lifetime defs
|
Function Style
*/
let fn_style = self.parse_unsafety();
let onceness = if self.eat_keyword(keywords::Once) {Once} else {Many};
let lifetime_defs = if self.eat(&token::Lt) {
let lifetime_defs = self.parse_lifetime_defs();
self.expect_gt();
lifetime_defs
} else {
Vec::new()
};
let lifetime_defs = self.parse_legacy_lifetime_defs(lifetime_defs);
let inputs = if self.eat(&token::OrOr) {
Vec::new()
@ -1152,7 +1203,7 @@ impl<'a> Parser<'a> {
TyClosure(P(ClosureTy {
fn_style: fn_style,
onceness: onceness,
onceness: Many,
bounds: bounds,
decl: decl,
lifetimes: lifetime_defs,
@ -1167,36 +1218,23 @@ impl<'a> Parser<'a> {
}
}
/// Parse a function type (following the 'fn')
pub fn parse_ty_fn_decl(&mut self, allow_variadic: bool)
-> (P<FnDecl>, Vec<ast::LifetimeDef>) {
/*
(fn) <'lt> (S) -> T
^~~~^ ^~^ ^
| | |
| | Return type
| Argument types
Lifetime_defs
*/
let lifetime_defs = if self.eat(&token::Lt) {
let lifetime_defs = self.parse_lifetime_defs();
self.expect_gt();
lifetime_defs
/// Parses `[ 'for' '<' lifetime_defs '>' ]'
fn parse_legacy_lifetime_defs(&mut self,
lifetime_defs: Vec<ast::LifetimeDef>)
-> Vec<ast::LifetimeDef>
{
if self.eat(&token::Lt) {
if lifetime_defs.is_empty() {
self.warn("deprecated syntax, use `for` keyword now");
let lifetime_defs = self.parse_lifetime_defs();
self.expect_gt();
lifetime_defs
} else {
self.fatal("cannot use new `for` keyword and older syntax together");
}
} else {
Vec::new()
};
let (inputs, variadic) = self.parse_fn_args(false, allow_variadic);
let (ret_style, ret_ty) = self.parse_ret_ty();
let decl = P(FnDecl {
inputs: inputs,
output: ret_ty,
cf: ret_style,
variadic: variadic
});
(decl, lifetime_defs)
lifetime_defs
}
}
/// Parses `type Foo;` in a trait declaration only. The `type` keyword has
@ -1433,25 +1471,24 @@ impl<'a> Parser<'a> {
self.expect(&token::CloseDelim(token::Bracket));
t
} else if self.token == token::BinOp(token::And) ||
self.token == token::AndAnd {
self.token == token::AndAnd {
// BORROWED POINTER
self.expect_and();
self.parse_borrowed_pointee()
} else if self.token.is_keyword(keywords::Extern) ||
self.token.is_keyword(keywords::Unsafe) ||
self.token_is_bare_fn_keyword() {
// BARE FUNCTION
self.parse_ty_bare_fn()
} else if self.token_is_closure_keyword() ||
self.token == token::BinOp(token::Or) ||
self.token == token::OrOr ||
(self.token == token::Lt &&
self.look_ahead(1, |t| {
*t == token::Gt || t.is_lifetime()
})) {
} else if self.token.is_keyword(keywords::For) {
self.parse_for_in_type()
} else if self.token_is_bare_fn_keyword() ||
self.token_is_closure_keyword() {
// BARE FUNCTION OR CLOSURE
self.parse_ty_bare_fn_or_ty_closure(Vec::new())
} else if self.token == token::BinOp(token::Or) ||
self.token == token::OrOr ||
(self.token == token::Lt &&
self.look_ahead(1, |t| {
*t == token::Gt || t.is_lifetime()
})) {
// CLOSURE
self.parse_ty_closure()
self.parse_ty_closure(Vec::new())
} else if self.eat_keyword(keywords::Typeof) {
// TYPEOF
// In order to not be ambiguous, the type must be surrounded by parens.
@ -1460,7 +1497,7 @@ impl<'a> Parser<'a> {
self.expect(&token::CloseDelim(token::Paren));
TyTypeof(e)
} else if self.eat_keyword(keywords::Proc) {
self.parse_proc_type()
self.parse_proc_type(Vec::new())
} else if self.token == token::Lt {
// QUALIFIED PATH
self.bump();
@ -1479,16 +1516,7 @@ impl<'a> Parser<'a> {
self.token.is_ident() ||
self.token.is_path() {
// NAMED TYPE
let mode = if plus_allowed {
LifetimeAndTypesAndBounds
} else {
LifetimeAndTypesWithoutColons
};
let PathAndBounds {
path,
bounds
} = self.parse_path(mode);
TyPath(path, bounds, ast::DUMMY_NODE_ID)
self.parse_ty_path(plus_allowed)
} else if self.eat(&token::Underscore) {
// TYPE TO BE INFERRED
TyInfer
@ -3848,29 +3876,17 @@ impl<'a> Parser<'a> {
}
// matches bounds = ( boundseq )?
// where boundseq = ( bound + boundseq ) | bound
// and bound = 'region | ty
// where boundseq = ( polybound + boundseq ) | polybound
// and polybound = ( 'for' '<' 'region '>' )? bound
// and bound = 'region | trait_ref
// NB: The None/Some distinction is important for issue #7264.
fn parse_ty_param_bounds(&mut self)
-> OwnedSlice<TyParamBound>
{
let mut result = vec!();
loop {
let lifetime_defs = if self.eat(&token::Lt) {
let lifetime_defs = self.parse_lifetime_defs();
self.expect_gt();
lifetime_defs
} else {
Vec::new()
};
match self.token {
token::Lifetime(lifetime) => {
if lifetime_defs.len() > 0 {
let span = self.last_span;
self.span_err(span, "lifetime declarations are not \
allowed here")
}
result.push(RegionTyParamBound(ast::Lifetime {
id: ast::DUMMY_NODE_ID,
span: self.span,
@ -3879,13 +3895,8 @@ impl<'a> Parser<'a> {
self.bump();
}
token::ModSep | token::Ident(..) => {
let path =
self.parse_path(LifetimeAndTypesWithoutColons).path;
result.push(TraitTyParamBound(ast::TraitRef {
path: path,
ref_id: ast::DUMMY_NODE_ID,
lifetimes: lifetime_defs,
}))
let poly_trait_ref = self.parse_poly_trait_ref();
result.push(TraitTyParamBound(poly_trait_ref))
}
_ => break,
}
@ -3898,7 +3909,7 @@ impl<'a> Parser<'a> {
return OwnedSlice::from_vec(result);
}
fn trait_ref_from_ident(ident: Ident, span: Span) -> ast::TraitRef {
fn trait_ref_from_ident(ident: Ident, span: Span) -> TraitRef {
let segment = ast::PathSegment {
identifier: ident,
parameters: ast::PathParameters::none()
@ -3911,7 +3922,6 @@ impl<'a> Parser<'a> {
ast::TraitRef {
path: path,
ref_id: ast::DUMMY_NODE_ID,
lifetimes: Vec::new(),
}
}
@ -3927,7 +3937,7 @@ impl<'a> Parser<'a> {
let mut unbound = None;
if self.eat(&token::Question) {
let tref = Parser::trait_ref_from_ident(ident, span);
unbound = Some(TraitTyParamBound(tref));
unbound = Some(tref);
span = self.span;
ident = self.parse_ident();
}
@ -4538,7 +4548,6 @@ impl<'a> Parser<'a> {
Some(TraitRef {
path: (*path).clone(),
ref_id: node_id,
lifetimes: Vec::new(),
})
}
TyPath(_, Some(_), _) => {
@ -4568,6 +4577,35 @@ impl<'a> Parser<'a> {
Some(attrs))
}
/// Parse a::B<String,int>
fn parse_trait_ref(&mut self) -> TraitRef {
ast::TraitRef {
path: self.parse_path(LifetimeAndTypesWithoutColons).path,
ref_id: ast::DUMMY_NODE_ID,
}
}
fn parse_late_bound_lifetime_defs(&mut self) -> Vec<ast::LifetimeDef> {
if self.eat_keyword(keywords::For) {
self.expect(&token::Lt);
let lifetime_defs = self.parse_lifetime_defs();
self.expect_gt();
lifetime_defs
} else {
Vec::new()
}
}
/// Parse for<'l> a::B<String,int>
fn parse_poly_trait_ref(&mut self) -> PolyTraitRef {
let lifetime_defs = self.parse_late_bound_lifetime_defs();
ast::PolyTraitRef {
bound_lifetimes: lifetime_defs,
trait_ref: self.parse_trait_ref()
}
}
/// Parse struct Foo { ... }
fn parse_item_struct(&mut self) -> ItemInfo {
let class_name = self.parse_ident();
@ -4681,7 +4719,7 @@ impl<'a> Parser<'a> {
else { Inherited }
}
fn parse_for_sized(&mut self) -> Option<ast::TyParamBound> {
fn parse_for_sized(&mut self) -> Option<ast::TraitRef> {
if self.eat_keyword(keywords::For) {
let span = self.span;
let ident = self.parse_ident();
@ -4691,7 +4729,7 @@ impl<'a> Parser<'a> {
return None;
}
let tref = Parser::trait_ref_from_ident(ident, span);
Some(TraitTyParamBound(tref))
Some(tref)
} else {
None
}

59
src/libsyntax/parse/token.rs
View File

@ -503,42 +503,41 @@ declare_special_idents_and_keywords! {
(27, Mod, "mod");
(28, Move, "move");
(29, Mut, "mut");
(30, Once, "once");
(31, Pub, "pub");
(32, Ref, "ref");
(33, Return, "return");
(30, Pub, "pub");
(31, Ref, "ref");
(32, Return, "return");
// Static and Self are also special idents (prefill de-dupes)
(super::STATIC_KEYWORD_NAME_NUM, Static, "static");
(super::SELF_KEYWORD_NAME_NUM, Self, "self");
(34, Struct, "struct");
(33, Struct, "struct");
(super::SUPER_KEYWORD_NAME_NUM, Super, "super");
(35, True, "true");
(36, Trait, "trait");
(37, Type, "type");
(38, Unsafe, "unsafe");
(39, Use, "use");
(40, Virtual, "virtual");
(41, While, "while");
(42, Continue, "continue");
(43, Proc, "proc");
(44, Box, "box");
(45, Const, "const");
(46, Where, "where");
(34, True, "true");
(35, Trait, "trait");
(36, Type, "type");
(37, Unsafe, "unsafe");
(38, Use, "use");
(39, Virtual, "virtual");
(40, While, "while");
(41, Continue, "continue");
(42, Proc, "proc");
(43, Box, "box");
(44, Const, "const");
(45, Where, "where");
'reserved:
(47, Alignof, "alignof");
(48, Be, "be");
(49, Offsetof, "offsetof");
(50, Priv, "priv");
(51, Pure, "pure");
(52, Sizeof, "sizeof");
(53, Typeof, "typeof");
(54, Unsized, "unsized");
(55, Yield, "yield");
(56, Do, "do");
(57, Abstract, "abstract");
(58, Final, "final");
(59, Override, "override");
(46, Alignof, "alignof");
(47, Be, "be");
(48, Offsetof, "offsetof");
(49, Priv, "priv");
(50, Pure, "pure");
(51, Sizeof, "sizeof");
(52, Typeof, "typeof");
(53, Unsized, "unsized");
(54, Yield, "yield");
(55, Do, "do");
(56, Abstract, "abstract");
(57, Final, "final");
(58, Override, "override");
}
}

40
src/libsyntax/print/pprust.rs
View File

@ -743,6 +743,9 @@ impl<'a> State<'a> {
ast::TyPath(ref path, ref bounds, _) => {
try!(self.print_bounded_path(path, bounds));
}
ast::TyPolyTraitRef(ref poly_trait_ref) => {
try!(self.print_poly_trait_ref(&**poly_trait_ref));
}
ast::TyQPath(ref qpath) => {
try!(word(&mut self.s, "<"));
try!(self.print_type(&*qpath.for_type));
@ -960,7 +963,7 @@ impl<'a> State<'a> {
try!(self.print_ident(item.ident));
try!(self.print_generics(generics));
match unbound {
&Some(TraitTyParamBound(ref tref)) => {
&Some(ref tref) => {
try!(space(&mut self.s));
try!(self.word_space("for"));
try!(self.print_trait_ref(tref));
@ -995,19 +998,21 @@ impl<'a> State<'a> {
}
fn print_trait_ref(&mut self, t: &ast::TraitRef) -> IoResult<()> {
if t.lifetimes.len() > 0 {
try!(self.print_generics(&ast::Generics {
lifetimes: t.lifetimes.clone(),
ty_params: OwnedSlice::empty(),
where_clause: ast::WhereClause {
id: ast::DUMMY_NODE_ID,
predicates: Vec::new(),
},
}));
}
self.print_path(&t.path, false)
}
fn print_poly_trait_ref(&mut self, t: &ast::PolyTraitRef) -> IoResult<()> {
if !t.bound_lifetimes.is_empty() {
try!(word(&mut self.s, "for<"));
for lifetime_def in t.bound_lifetimes.iter() {
try!(self.print_lifetime_def(lifetime_def));
}
try!(word(&mut self.s, ">"));
}
self.print_trait_ref(&t.trait_ref)
}
pub fn print_enum_def(&mut self, enum_definition: &ast::EnumDef,
generics: &ast::Generics, ident: ast::Ident,
span: codemap::Span,
@ -2383,7 +2388,7 @@ impl<'a> State<'a> {
try!(match *bound {
TraitTyParamBound(ref tref) => {
self.print_trait_ref(tref)
self.print_poly_trait_ref(tref)
}
RegionTyParamBound(ref lt) => {
self.print_lifetime(lt)
@ -2450,7 +2455,7 @@ impl<'a> State<'a> {
pub fn print_ty_param(&mut self, param: &ast::TyParam) -> IoResult<()> {
match param.unbound {
Some(TraitTyParamBound(ref tref)) => {
Some(ref tref) => {
try!(self.print_trait_ref(tref));
try!(self.word_space("?"));
}
@ -2658,12 +2663,10 @@ impl<'a> State<'a> {
} else if opt_sigil == Some('&') {
try!(self.print_fn_style(fn_style));
try!(self.print_extern_opt_abi(opt_abi));
try!(self.print_onceness(onceness));
} else {
assert!(opt_sigil.is_none());
try!(self.print_fn_style(fn_style));
try!(self.print_opt_abi_and_extern_if_nondefault(opt_abi));
try!(self.print_onceness(onceness));
try!(word(&mut self.s, "fn"));
}
@ -2982,13 +2985,6 @@ impl<'a> State<'a> {
ast::UnsafeFn => self.word_nbsp("unsafe"),
}
}
pub fn print_onceness(&mut self, o: ast::Onceness) -> IoResult<()> {
match o {
ast::Once => self.word_nbsp("once"),
ast::Many => Ok(())
}
}
}
#[cfg(test)]

29
src/libsyntax/visit.rs
View File

@ -75,6 +75,10 @@ pub trait Visitor<'v> {
}
fn visit_ty_method(&mut self, t: &'v TypeMethod) { walk_ty_method(self, t) }
fn visit_trait_item(&mut self, t: &'v TraitItem) { walk_trait_item(self, t) }
fn visit_trait_ref(&mut self, t: &'v TraitRef) { walk_trait_ref(self, t) }
fn visit_poly_trait_ref(&mut self, t: &'v PolyTraitRef) {
walk_poly_trait_ref(self, t)
}
fn visit_struct_def(&mut self, s: &'v StructDef, _: Ident, _: &'v Generics, _: NodeId) {
walk_struct_def(self, s)
}
@ -202,9 +206,20 @@ pub fn walk_explicit_self<'v, V: Visitor<'v>>(visitor: &mut V,
/// Like with walk_method_helper this doesn't correspond to a method
/// in Visitor, and so it gets a _helper suffix.
pub fn walk_trait_ref_helper<'v,V>(visitor: &mut V, trait_ref: &'v TraitRef)
where V: Visitor<'v> {
walk_lifetime_decls(visitor, &trait_ref.lifetimes);
pub fn walk_poly_trait_ref<'v, V>(visitor: &mut V,
trait_ref: &'v PolyTraitRef)
where V: Visitor<'v>
{
walk_lifetime_decls(visitor, &trait_ref.bound_lifetimes);
visitor.visit_trait_ref(&trait_ref.trait_ref);
}
/// Like with walk_method_helper this doesn't correspond to a method
/// in Visitor, and so it gets a _helper suffix.
pub fn walk_trait_ref<'v,V>(visitor: &mut V,
trait_ref: &'v TraitRef)
where V: Visitor<'v>
{
visitor.visit_path(&trait_ref.path, trait_ref.ref_id)
}
@ -248,8 +263,7 @@ pub fn walk_item<'v, V: Visitor<'v>>(visitor: &mut V, item: &'v Item) {
ref impl_items) => {
visitor.visit_generics(type_parameters);
match *trait_reference {
Some(ref trait_reference) => walk_trait_ref_helper(visitor,
trait_reference),
Some(ref trait_reference) => visitor.visit_trait_ref(trait_reference),
None => ()
}
visitor.visit_ty(&**typ);
@ -383,6 +397,9 @@ pub fn walk_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty) {
visitor.visit_ty(&**ty);
visitor.visit_expr(&**expression)
}
TyPolyTraitRef(ref poly_trait_ref) => {
visitor.visit_poly_trait_ref(&**poly_trait_ref)
}
TyTypeof(ref expression) => {
visitor.visit_expr(&**expression)
}
@ -497,7 +514,7 @@ pub fn walk_ty_param_bounds<'v, V: Visitor<'v>>(visitor: &mut V,
for bound in bounds.iter() {
match *bound {
TraitTyParamBound(ref typ) => {
walk_trait_ref_helper(visitor, typ)
visitor.visit_poly_trait_ref(typ)
}
RegionTyParamBound(ref lifetime) => {
visitor.visit_lifetime_ref(lifetime);

2
src/test/compile-fail/issue-10291.rs
View File

@ -9,7 +9,7 @@
// except according to those terms.
fn test<'x>(x: &'x int) {
drop::< <'z>|&'z int| -> &'z int >(|z| {
drop::< for<'z>|&'z int| -> &'z int >(|z| {
x
//~^ ERROR cannot infer an appropriate lifetime
});

28
src/test/compile-fail/once-cant-call-twice-on-stack.rs
View File

@ -1,28 +0,0 @@
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Testing guarantees provided by once functions.
// This program would segfault if it were legal.
#![feature(once_fns)]
use std::sync::Arc;
fn foo(blk: once ||) {
blk();
blk(); //~ ERROR use of moved value
}
fn main() {
let x = Arc::new(true);
foo(|| {
assert!(*x);
drop(x);
})
}

27
src/test/compile-fail/once-cant-move-out-of-non-once-on-stack.rs
View File

@ -1,27 +0,0 @@
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Testing guarantees provided by once functions.
// This program would segfault if it were legal.
use std::sync::Arc;
fn foo(blk: ||) {
blk();
blk();
}
fn main() {
let x = Arc::new(true);
foo(|| {
assert!(*x);
drop(x); //~ ERROR cannot move out of captured outer variable
})
}

17
src/test/compile-fail/once-fn-subtyping.rs
View File

@ -1,17 +0,0 @@
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![feature(once_fns)]
fn main() {
let f: once || = ||();
let g: || = f; //~ ERROR mismatched types
let h: || = ||();
let i: once || = h; // ok
}

4
src/test/compile-fail/regions-fn-subtyping-return-static.rs
View File

@ -22,11 +22,11 @@
struct S;
// Given 'cx, return 'cx
type F = fn<'cx>(&'cx S) -> &'cx S;
type F = for<'cx> fn(&'cx S) -> &'cx S;
fn want_F(f: F) { }
// Given anything, return 'static
type G = fn<'cx>(&'cx S) -> &'static S;
type G = for<'cx> fn(&'cx S) -> &'static S;
fn want_G(f: G) { }
// Should meet both.

24
src/test/compile-fail/regions-fn-subtyping.rs
View File

@ -17,29 +17,29 @@ fn test_fn<'x,'y,'z,T>(_x: &'x T, _y: &'y T, _z: &'z T) {
// subtype::<T1>(of::<T2>()) will typecheck
// iff T1 <: T2.
subtype::< <'a>|&'a T|>(
of::< <'a>|&'a T|>());
subtype::< for<'a>|&'a T|>(
of::< for<'a>|&'a T|>());
subtype::< <'a>|&'a T|>(
of::< <'b>|&'b T|>());
subtype::< for<'a>|&'a T|>(
of::< for<'b>|&'b T|>());
subtype::< <'b>|&'b T|>(
subtype::< for<'b>|&'b T|>(
of::<|&'x T|>());
subtype::<|&'x T|>(
of::< <'b>|&'b T|>()); //~ ERROR mismatched types
of::< for<'b>|&'b T|>()); //~ ERROR mismatched types
subtype::< <'a,'b>|&'a T, &'b T|>(
of::< <'a>|&'a T, &'a T|>());
subtype::< for<'a,'b>|&'a T, &'b T|>(
of::< for<'a>|&'a T, &'a T|>());
subtype::< <'a>|&'a T, &'a T|>(
of::< <'a,'b>|&'a T, &'b T|>()); //~ ERROR mismatched types
subtype::< for<'a>|&'a T, &'a T|>(
of::< for<'a,'b>|&'a T, &'b T|>()); //~ ERROR mismatched types
subtype::< <'a,'b>|&'a T, &'b T|>(
subtype::< for<'a,'b>|&'a T, &'b T|>(
of::<|&'x T, &'y T|>());
subtype::<|&'x T, &'y T|>(
of::< <'a,'b>|&'a T, &'b T|>()); //~ ERROR mismatched types
of::< for<'a,'b>|&'a T, &'b T|>()); //~ ERROR mismatched types
}
fn main() {}

1
src/test/compile-fail/regions-name-duplicated.rs
View File

@ -9,7 +9,6 @@
// except according to those terms.
struct Foo<'a, 'a> { //~ ERROR lifetime name `'a` declared twice
//~^ ERROR lifetime name `'a` declared twice
x: &'a int
}

1
src/test/compile-fail/regions-name-static.rs
View File

@ -9,7 +9,6 @@
// except according to those terms.
struct Foo<'static> { //~ ERROR illegal lifetime parameter name: `'static`
//~^ ERROR illegal lifetime parameter name: `'static`
x: &'static int
}

12
src/test/compile-fail/regions-name-undeclared.rs
View File

@ -43,16 +43,16 @@ fn bar<'a>(x: &'a int) {
// &'a CAN be declared on functions and used then:
fn g<'a>(a: &'a int) { } // OK
fn h(a: <'a>|&'a int|) { } // OK
fn h(a: for<'a>|&'a int|) { } // OK
}
// Test nesting of lifetimes in fn type declarations
fn fn_types(a: &'a int, //~ ERROR undeclared lifetime
b: <'a>|a: &'a int,
b: &'b int, //~ ERROR undeclared lifetime
c: <'b>|a: &'a int,
b: &'b int|,
d: &'b int|, //~ ERROR undeclared lifetime
b: for<'a>|a: &'a int,
b: &'b int, //~ ERROR undeclared lifetime
c: for<'b>|a: &'a int,
b: &'b int|,
d: &'b int|, //~ ERROR undeclared lifetime
c: &'a int) //~ ERROR undeclared lifetime
{
}

2
src/test/compile-fail/regions-nested-fns-2.rs
View File

@ -8,7 +8,7 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.
fn ignore(_f: <'z>|&'z int| -> &'z int) {}
fn ignore(_f: for<'z>|&'z int| -> &'z int) {}
fn nested() {
let y = 3;

4
src/test/compile-fail/regions-nested-fns.rs
View File

@ -14,13 +14,13 @@ fn nested<'x>(x: &'x int) {
let y = 3;
let mut ay = &y; //~ ERROR cannot infer
ignore::< <'z>|&'z int|>(|z| {
ignore::< for<'z>|&'z int|>(|z| {
ay = x;
ay = &y;
ay = z;
});
ignore::< <'z>|&'z int| -> &'z int>(|z| {
ignore::< for<'z>|&'z int| -> &'z int>(|z| {
if false { return x; } //~ ERROR cannot infer an appropriate lifetime for automatic
if false { return ay; }
return z;

2
src/test/compile-fail/regions-ret-borrowed-1.rs
View File

@ -12,7 +12,7 @@
// some point regions-ret-borrowed reported an error but this file did
// not, due to special hardcoding around the anonymous region.
fn with<R>(f: <'a>|x: &'a int| -> R) -> R {
fn with<R>(f: for<'a>|x: &'a int| -> R) -> R {
f(&3)
}

48
src/test/run-pass/hrtb-parse.rs Normal file
View File

@ -0,0 +1,48 @@
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Test that we can parse all the various places that a `for` keyword
// can appear representing universal quantification.
#![allow(unused_variables)]
#![allow(dead_code)]
trait Get<A,R> {
fn get(&self, arg: A) -> R;
}
// Parse HRTB with explicit `for` in a where-clause:
fn foo00<T>(t: T)
where T : for<'a> Get<&'a int, &'a int>
{
}
fn foo01<T: for<'a> Get<&'a int, &'a int>>(t: T)
{
}
// Parse HRTB with explicit `for` in various sorts of types:
fn foo10(t: Box<for<'a> Get<int, int>>) { }
fn foo11(t: Box<for<'a> Get(int) -> int>) { }
fn foo20(t: for<'a> fn(int) -> int) { }
fn foo21(t: for<'a> unsafe fn(int) -> int) { }
fn foo22(t: for<'a> extern "C" fn(int) -> int) { }
fn foo23(t: for<'a> unsafe extern "C" fn(int) -> int) { }
fn foo30(t: for<'a> |int| -> int) { }
fn foo31(t: for<'a> unsafe |int| -> int) { }
//fn foo40(t: for<'a> proc(int) -> int) { }
fn main() {
}

2
src/test/run-pass/nullable-pointer-ffi-compat.rs
View File

@ -29,7 +29,7 @@ static FOO: int = 0xDEADBEE;
pub fn main() {
unsafe {
let f: extern "C" fn<'a>(&'a int) -> &'a int = mem::transmute(foo);
let f: for<'a> extern "C" fn(&'a int) -> &'a int = mem::transmute(foo);
assert_eq!(*f(&FOO), FOO);
}
}

1
src/test/run-pass/once-move-out-on-heap.rs
View File

@ -11,7 +11,6 @@
// Testing guarantees provided by once functions.
#![feature(once_fns)]
use std::sync::Arc;
fn foo(blk: proc()) {

27
src/test/run-pass/once-move-out-on-stack.rs
View File

@ -1,27 +0,0 @@
// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Testing guarantees provided by once functions.
#![feature(once_fns)]
use std::sync::Arc;
fn foo(blk: once ||) {
blk();
}
pub fn main() {
let x = Arc::new(true);
foo(|| {
assert!(*x);
drop(x);
})
}