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auto merge of #13461 : eddyb/rust/cleanup-at-fn, r=luqmana

This commit is contained in:
bors 2014-04-12 22:21:56 -07:00
parent e4178db07c 9d570ad8c1
commit 96aeb7e3c3
36 changed files with 334 additions and 552 deletions
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3
src/librustc/front/feature_gate.rs
View File

@ -260,8 +260,7 @@ impl<'a> Visitor<()> for Context<'a> {
fn visit_ty(&mut self, t: &ast::Ty, _: ()) {
match t.node {
ast::TyClosure(closure) if closure.onceness == ast::Once &&
closure.sigil != ast::OwnedSigil => {
ast::TyClosure(closure, _) if closure.onceness == ast::Once => {
self.gate_feature("once_fns", t.span,
"once functions are \
experimental and likely to be removed");

15
src/librustc/metadata/tydecode.rs
View File

@ -137,15 +137,6 @@ pub fn parse_substs_data(data: &[u8], crate_num: ast::CrateNum, pos: uint, tcx:
parse_substs(&mut st, conv)
}
fn parse_sigil(st: &mut PState) -> ast::Sigil {
match next(st) {
'@' => ast::ManagedSigil,
'~' => ast::OwnedSigil,
'&' => ast::BorrowedSigil,
c => st.tcx.sess.bug(format!("parse_sigil(): bad input '{}'", c))
}
}
fn parse_vstore<M>(st: &mut PState, conv: conv_did,
parse_mut: |&mut PState| -> M) -> ty::Vstore<M> {
assert_eq!(next(st), '/');
@ -476,17 +467,15 @@ fn parse_onceness(c: char) -> ast::Onceness {
}
fn parse_closure_ty(st: &mut PState, conv: conv_did) -> ty::ClosureTy {
let sigil = parse_sigil(st);
let fn_style = parse_fn_style(next(st));
let onceness = parse_onceness(next(st));
let region = parse_region(st, |x,y| conv(x,y));
let store = parse_trait_store(st, |x,y| conv(x,y));
let bounds = parse_bounds(st, |x,y| conv(x,y));
let sig = parse_sig(st, |x,y| conv(x,y));
ty::ClosureTy {
fn_style: fn_style,
sigil: sigil,
onceness: onceness,
region: region,
store: store,
bounds: bounds.builtin_bounds,
sig: sig
}

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

@ -327,14 +327,6 @@ fn enc_sty(w: &mut MemWriter, cx: &ctxt, st: &ty::sty) {
}
}
fn enc_sigil(w: &mut MemWriter, sigil: Sigil) {
match sigil {
ManagedSigil => mywrite!(w, "@"),
OwnedSigil => mywrite!(w, "~"),
BorrowedSigil => mywrite!(w, "&"),
}
}
fn enc_fn_style(w: &mut MemWriter, p: FnStyle) {
match p {
NormalFn => mywrite!(w, "n"),
@ -363,10 +355,9 @@ pub fn enc_bare_fn_ty(w: &mut MemWriter, cx: &ctxt, ft: &ty::BareFnTy) {
}
fn enc_closure_ty(w: &mut MemWriter, cx: &ctxt, ft: &ty::ClosureTy) {
enc_sigil(w, ft.sigil);
enc_fn_style(w, ft.fn_style);
enc_onceness(w, ft.onceness);
enc_region(w, cx, ft.region);
enc_trait_store(w, cx, ft.store);
let bounds = ty::ParamBounds {builtin_bounds: ft.bounds,
trait_bounds: Vec::new()};
enc_bounds(w, cx, &bounds);

13
src/librustc/middle/astencode.rs
View File

@ -897,10 +897,9 @@ impl<'a> ebml_writer_helpers for Encoder<'a> {
fn emit_auto_adjustment(&mut self, ecx: &e::EncodeContext, adj: &ty::AutoAdjustment) {
self.emit_enum("AutoAdjustment", |this| {
match *adj {
ty::AutoAddEnv(region, sigil) => {
this.emit_enum_variant("AutoAddEnv", 0, 2, |this| {
this.emit_enum_variant_arg(0, |this| region.encode(this));
this.emit_enum_variant_arg(1, |this| sigil.encode(this))
ty::AutoAddEnv(store) => {
this.emit_enum_variant("AutoAddEnv", 0, 1, |this| {
this.emit_enum_variant_arg(0, |this| store.encode(this))
})
}
@ -1270,12 +1269,10 @@ impl<'a> ebml_decoder_decoder_helpers for reader::Decoder<'a> {
this.read_enum_variant(variants, |this, i| {
Ok(match i {
0 => {
let region: ty::Region =
let store: ty::TraitStore =
this.read_enum_variant_arg(0, |this| Decodable::decode(this)).unwrap();
let sigil: ast::Sigil =
this.read_enum_variant_arg(1, |this| Decodable::decode(this)).unwrap();
ty:: AutoAddEnv(region.tr(xcx), sigil)
ty:: AutoAddEnv(store.tr(xcx))
}
1 => {
let auto_deref_ref: ty::AutoDerefRef =

11
src/librustc/middle/borrowck/gather_loans/mod.rs
View File

@ -451,17 +451,8 @@ impl<'a> GatherLoanCtxt<'a> {
r,
AutoRef)
}
ty::AutoBorrowFn(r) => {
let cmt_deref = mc.cat_deref_fn_or_obj(expr, cmt, 0);
self.guarantee_valid(expr.id,
expr.span,
cmt_deref,
ast::MutImmutable,
r,
AutoRef)
}
ty::AutoBorrowObj(r, m) => {
let cmt_deref = mc.cat_deref_fn_or_obj(expr, cmt, 0);
let cmt_deref = mc.cat_deref_obj(expr, cmt);
self.guarantee_valid(expr.id,
expr.span,
cmt_deref,

2
src/librustc/middle/borrowck/mod.rs
View File

@ -620,7 +620,7 @@ impl<'a> BorrowckCtxt<'a> {
fn move_suggestion(tcx: &ty::ctxt, ty: ty::t, default_msg: &'static str)
-> &'static str {
match ty::get(ty).sty {
ty::ty_closure(ref cty) if cty.sigil == ast::BorrowedSigil =>
ty::ty_closure(~ty::ClosureTy { store: ty::RegionTraitStore(..), .. }) =>
"a non-copyable stack closure (capture it in a new closure, \
e.g. `|x| f(x)`, to override)",
_ if ty::type_moves_by_default(tcx, ty) =>

26
src/librustc/middle/kind.rs
View File

@ -197,27 +197,13 @@ fn with_appropriate_checker(cx: &Context,
let fty = ty::node_id_to_type(cx.tcx, id);
match ty::get(fty).sty {
ty::ty_closure(~ty::ClosureTy {
sigil: OwnedSigil,
bounds: bounds,
..
}) => {
b(|cx, fv| check_for_uniq(cx, fv, bounds))
}
store: ty::UniqTraitStore, bounds, ..
}) => b(|cx, fv| check_for_uniq(cx, fv, bounds)),
ty::ty_closure(~ty::ClosureTy {
sigil: ManagedSigil,
..
}) => {
// can't happen
fail!("internal error: saw closure with managed sigil (@fn)");
}
ty::ty_closure(~ty::ClosureTy {
sigil: BorrowedSigil,
bounds: bounds,
region: region,
..
}) => {
b(|cx, fv| check_for_block(cx, fv, bounds, region))
}
store: ty::RegionTraitStore(region, _), bounds, ..
}) => b(|cx, fv| check_for_block(cx, fv, bounds, region)),
ty::ty_bare_fn(_) => {
b(check_for_bare)
}

6
src/librustc/middle/lint.rs
View File

@ -919,10 +919,8 @@ fn check_heap_type(cx: &Context, span: Span, ty: ty::t) {
}
ty::ty_uniq(_) | ty::ty_str(ty::VstoreUniq) |
ty::ty_vec(_, ty::VstoreUniq) |
ty::ty_trait(~ty::TyTrait { store: ty::UniqTraitStore, .. }) => {
n_uniq += 1;
}
ty::ty_closure(ref c) if c.sigil == ast::OwnedSigil => {
ty::ty_trait(~ty::TyTrait { store: ty::UniqTraitStore, .. }) |
ty::ty_closure(~ty::ClosureTy { store: ty::UniqTraitStore, .. }) => {
n_uniq += 1;
}

33
src/librustc/middle/mem_categorization.rs
View File

@ -76,7 +76,7 @@ use syntax::parse::token;
pub enum categorization {
cat_rvalue(ty::Region), // temporary val, argument is its scope
cat_static_item,
cat_copied_upvar(CopiedUpvar), // upvar copied into @fn or ~fn env
cat_copied_upvar(CopiedUpvar), // upvar copied into proc env
cat_upvar(ty::UpvarId, ty::UpvarBorrow), // by ref upvar from stack closure
cat_local(ast::NodeId), // local variable
cat_arg(ast::NodeId), // formal argument
@ -172,7 +172,7 @@ pub fn opt_deref_kind(t: ty::t) -> Option<deref_kind> {
ty::ty_trait(~ty::TyTrait { store: ty::UniqTraitStore, .. }) |
ty::ty_vec(_, ty::VstoreUniq) |
ty::ty_str(ty::VstoreUniq) |
ty::ty_closure(~ty::ClosureTy {sigil: ast::OwnedSigil, ..}) => {
ty::ty_closure(~ty::ClosureTy {store: ty::UniqTraitStore, ..}) => {
Some(deref_ptr(OwnedPtr))
}
@ -187,8 +187,7 @@ pub fn opt_deref_kind(t: ty::t) -> Option<deref_kind> {
}
ty::ty_str(ty::VstoreSlice(r, ())) |
ty::ty_closure(~ty::ClosureTy {sigil: ast::BorrowedSigil,
region: r, ..}) => {
ty::ty_closure(~ty::ClosureTy {store: ty::RegionTraitStore(r, _), ..}) => {
Some(deref_ptr(BorrowedPtr(ty::ImmBorrow, r)))
}
@ -540,15 +539,14 @@ impl<TYPER:Typer> MemCategorizationContext<TYPER> {
// Decide whether to use implicit reference or by copy/move
// capture for the upvar. This, combined with the onceness,
// determines whether the closure can move out of it.
let var_is_refd = match (closure_ty.sigil, closure_ty.onceness) {
let var_is_refd = match (closure_ty.store, closure_ty.onceness) {
// Many-shot stack closures can never move out.
(ast::BorrowedSigil, ast::Many) => true,
(ty::RegionTraitStore(..), ast::Many) => true,
// 1-shot stack closures can move out.
(ast::BorrowedSigil, ast::Once) => false,
(ty::RegionTraitStore(..), ast::Once) => false,
// Heap closures always capture by copy/move, and can
// move out if they are once.
(ast::OwnedSigil, _) |
(ast::ManagedSigil, _) => false,
(ty::UniqTraitStore, _) => false,
};
if var_is_refd {
@ -688,19 +686,8 @@ impl<TYPER:Typer> MemCategorizationContext<TYPER> {
}
}
pub fn cat_deref_fn_or_obj<N:ast_node>(&mut self,
node: &N,
base_cmt: cmt,
deref_cnt: uint)
-> cmt {
// Bit of a hack: the "dereference" of a function pointer like
// `@fn()` is a mere logical concept. We interpret it as
// dereferencing the environment pointer; of course, we don't
// know what type lies at the other end, so we just call it
// `()` (the empty tuple).
let opaque_ty = ty::mk_tup(self.tcx(), Vec::new());
self.cat_deref_common(node, base_cmt, deref_cnt, opaque_ty)
pub fn cat_deref_obj<N:ast_node>(&mut self, node: &N, base_cmt: cmt) -> cmt {
self.cat_deref_common(node, base_cmt, 0, ty::mk_nil())
}
fn cat_deref<N:ast_node>(&mut self,
@ -1105,7 +1092,7 @@ impl<TYPER:Typer> MemCategorizationContext<TYPER> {
~"static item"
}
cat_copied_upvar(_) => {
~"captured outer variable in a heap closure"
~"captured outer variable in a proc"
}
cat_rvalue(..) => {
~"non-lvalue"

46
src/librustc/middle/moves.rs
View File

@ -650,30 +650,30 @@ impl<'a> VisitContext<'a> {
let _indenter = indenter();
let fn_ty = ty::node_id_to_type(self.tcx, fn_expr_id);
let sigil = ty::ty_closure_sigil(fn_ty);
let freevars = freevars::get_freevars(self.tcx, fn_expr_id);
let v = if sigil == BorrowedSigil {
// || captures everything by ref
freevars.iter()
.map(|fvar| CaptureVar {def: fvar.def, span: fvar.span, mode: CapRef})
.collect()
} else {
// @fn() and ~fn() capture by copy or by move depending on type
freevars.iter()
.map(|fvar| {
let fvar_def_id = ast_util::def_id_of_def(fvar.def).node;
let fvar_ty = ty::node_id_to_type(self.tcx, fvar_def_id);
debug!("fvar_def_id={:?} fvar_ty={}",
fvar_def_id, ppaux::ty_to_str(self.tcx, fvar_ty));
let mode = if ty::type_moves_by_default(self.tcx, fvar_ty) {
CapMove
} else {
CapCopy
};
CaptureVar {def: fvar.def, span: fvar.span, mode:mode}
Rc::new(match ty::ty_closure_store(fn_ty) {
ty::RegionTraitStore(..) => {
// || captures everything by ref
freevars.iter()
.map(|fvar| CaptureVar {def: fvar.def, span: fvar.span, mode: CapRef})
.collect()
}
ty::UniqTraitStore => {
// proc captures by copy or by move depending on type
freevars.iter()
.map(|fvar| {
let fvar_def_id = ast_util::def_id_of_def(fvar.def).node;
let fvar_ty = ty::node_id_to_type(self.tcx, fvar_def_id);
debug!("fvar_def_id={:?} fvar_ty={}",
fvar_def_id, ppaux::ty_to_str(self.tcx, fvar_ty));
let mode = if ty::type_moves_by_default(self.tcx, fvar_ty) {
CapMove
} else {
CapCopy
};
CaptureVar {def: fvar.def, span: fvar.span, mode:mode}
}).collect()
};
Rc::new(v)
}
})
}
}

2
src/librustc/middle/resolve.rs
View File

@ -4274,7 +4274,7 @@ impl<'a> Resolver<'a> {
});
}
TyClosure(c) => {
TyClosure(c, _) | TyProc(c) => {
c.bounds.as_ref().map(|bounds| {
for bound in bounds.iter() {
self.resolve_type_parameter_bound(ty.id, bound);

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

@ -112,7 +112,9 @@ impl<'a, 'b> Visitor<Scope<'a>> for LifetimeContext<'b> {
fn visit_ty(&mut self, ty: &ast::Ty, scope: Scope<'a>) {
match ty.node {
ast::TyClosure(c) => push_fn_scope(self, ty, scope, &c.lifetimes),
ast::TyClosure(c, _) | ast::TyProc(c) => {
push_fn_scope(self, ty, scope, &c.lifetimes);
}
ast::TyBareFn(c) => push_fn_scope(self, ty, scope, &c.lifetimes),
_ => visit::walk_ty(self, ty, scope),
}

2
src/librustc/middle/trans/base.rs
View File

@ -260,7 +260,7 @@ pub fn decl_rust_fn(ccx: &CrateContext, has_env: bool,
// noalias because the actual object pointer is nested.
ty::ty_uniq(..) | // ty::ty_trait(_, _, ty::UniqTraitStore, _, _) |
ty::ty_vec(_, ty::VstoreUniq) | ty::ty_str(ty::VstoreUniq) |
ty::ty_closure(~ty::ClosureTy {sigil: ast::OwnedSigil, ..}) => {
ty::ty_closure(~ty::ClosureTy {store: ty::UniqTraitStore, ..}) => {
unsafe {
llvm::LLVMAddAttribute(llarg, lib::llvm::NoAliasAttribute as c_uint);
}

60
src/librustc/middle/trans/closure.rs
View File

@ -38,17 +38,14 @@ use syntax::ast_util;
// roughly as follows:
//
// struct rust_opaque_box { // see rust_internal.h
// unsigned ref_count; // only used for @fn()
// type_desc *tydesc; // describes closure_data struct
// rust_opaque_box *prev; // (used internally by memory alloc)
// rust_opaque_box *next; // (used internally by memory alloc)
// unsigned ref_count; // obsolete (part of @T's header)
// fn(void*) *drop_glue; // destructor (for proc)
// rust_opaque_box *prev; // obsolete (part of @T's header)
// rust_opaque_box *next; // obsolete (part of @T's header)
// struct closure_data {
// type_desc *bound_tdescs[]; // bound descriptors
// struct {
// upvar1_t upvar1;
// ...
// upvarN_t upvarN;
// } bound_data;
// upvar1_t upvar1;
// ...
// upvarN_t upvarN;
// }
// };
//
@ -158,24 +155,21 @@ fn tuplify_box_ty(tcx: &ty::ctxt, t: ty::t) -> ty::t {
}
fn allocate_cbox<'a>(bcx: &'a Block<'a>,
sigil: ast::Sigil,
store: ty::TraitStore,
cdata_ty: ty::t)
-> Result<'a> {
let _icx = push_ctxt("closure::allocate_cbox");
let tcx = bcx.tcx();
// Allocate and initialize the box:
match sigil {
ast::ManagedSigil => {
tcx.sess.bug("trying to trans allocation of @fn")
}
ast::OwnedSigil => {
match store {
ty::UniqTraitStore => {
let ty = type_of(bcx.ccx(), cdata_ty);
let size = llsize_of(bcx.ccx(), ty);
// we treat proc as @ here, which isn't ideal
malloc_raw_dyn_managed(bcx, cdata_ty, ClosureExchangeMallocFnLangItem, size)
}
ast::BorrowedSigil => {
ty::RegionTraitStore(..) => {
let cbox_ty = tuplify_box_ty(tcx, cdata_ty);
let llbox = alloc_ty(bcx, cbox_ty, "__closure");
rslt(bcx, llbox)
@ -196,7 +190,7 @@ pub struct ClosureResult<'a> {
pub fn store_environment<'a>(
bcx: &'a Block<'a>,
bound_values: Vec<EnvValue> ,
sigil: ast::Sigil)
store: ty::TraitStore)
-> ClosureResult<'a> {
let _icx = push_ctxt("closure::store_environment");
let ccx = bcx.ccx();
@ -220,7 +214,7 @@ pub fn store_environment<'a>(
}
// allocate closure in the heap
let Result {bcx: bcx, val: llbox} = allocate_cbox(bcx, sigil, cdata_ty);
let Result {bcx: bcx, val: llbox} = allocate_cbox(bcx, store, cdata_ty);
let llbox = PointerCast(bcx, llbox, llboxptr_ty);
debug!("tuplify_box_ty = {}", ty_to_str(tcx, cbox_ty));
@ -254,7 +248,7 @@ pub fn store_environment<'a>(
// collects the upvars and packages them up for store_environment.
fn build_closure<'a>(bcx0: &'a Block<'a>,
cap_vars: &[moves::CaptureVar],
sigil: ast::Sigil)
store: ty::TraitStore)
-> ClosureResult<'a> {
let _icx = push_ctxt("closure::build_closure");
@ -268,7 +262,11 @@ fn build_closure<'a>(bcx0: &'a Block<'a>,
let datum = expr::trans_local_var(bcx, cap_var.def);
match cap_var.mode {
moves::CapRef => {
assert_eq!(sigil, ast::BorrowedSigil);
let is_region_closure = match store {
ty::RegionTraitStore(..) => true,
ty::UniqTraitStore => false
};
assert!(is_region_closure);
env_vals.push(EnvValue {action: EnvRef,
datum: datum});
}
@ -283,7 +281,7 @@ fn build_closure<'a>(bcx0: &'a Block<'a>,
}
}
return store_environment(bcx, env_vals, sigil);
store_environment(bcx, env_vals, store)
}
// Given an enclosing block context, a new function context, a closure type,
@ -291,7 +289,7 @@ fn build_closure<'a>(bcx0: &'a Block<'a>,
// with the upvars and type descriptors.
fn load_environment<'a>(bcx: &'a Block<'a>, cdata_ty: ty::t,
cap_vars: &[moves::CaptureVar],
sigil: ast::Sigil) -> &'a Block<'a> {
store: ty::TraitStore) -> &'a Block<'a> {
let _icx = push_ctxt("closure::load_environment");
// Don't bother to create the block if there's nothing to load
@ -316,9 +314,9 @@ fn load_environment<'a>(bcx: &'a Block<'a>, cdata_ty: ty::t,
let mut i = 0u;
for cap_var in cap_vars.iter() {
let mut upvarptr = GEPi(bcx, llcdata, [0u, i]);
match sigil {
ast::BorrowedSigil => { upvarptr = Load(bcx, upvarptr); }
ast::ManagedSigil | ast::OwnedSigil => {}
match store {
ty::RegionTraitStore(..) => { upvarptr = Load(bcx, upvarptr); }
ty::UniqTraitStore => {}
}
let def_id = ast_util::def_id_of_def(cap_var.def);
@ -331,7 +329,7 @@ fn load_environment<'a>(bcx: &'a Block<'a>, cdata_ty: ty::t,
cdata_ty,
env_pointer_alloca,
i,
sigil,
store,
cap_var.span);
}
@ -349,7 +347,7 @@ fn fill_fn_pair(bcx: &Block, pair: ValueRef, llfn: ValueRef, llenvptr: ValueRef)
pub fn trans_expr_fn<'a>(
bcx: &'a Block<'a>,
sigil: ast::Sigil,
store: ty::TraitStore,
decl: &ast::FnDecl,
body: &ast::Block,
id: ast::NodeId,
@ -359,7 +357,7 @@ pub fn trans_expr_fn<'a>(
*
* Translates the body of a closure expression.
*
* - `sigil`
* - `store`
* - `decl`
* - `body`
* - `id`: The id of the closure expression.
@ -399,11 +397,11 @@ pub fn trans_expr_fn<'a>(
let cap_vars = ccx.maps.capture_map.borrow().get_copy(&id);
let ClosureResult {llbox, cdata_ty, bcx} =
build_closure(bcx, cap_vars.as_slice(), sigil);
build_closure(bcx, cap_vars.as_slice(), store);
trans_closure(ccx, decl, body, llfn,
bcx.fcx.param_substs, id,
[], ty::ty_fn_ret(fty),
|bcx| load_environment(bcx, cdata_ty, cap_vars.as_slice(), sigil));
|bcx| load_environment(bcx, cdata_ty, cap_vars.as_slice(), store));
fill_fn_pair(bcx, dest_addr, llfn, llbox);
bcx

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

@ -191,7 +191,7 @@ pub fn const_expr(cx: &CrateContext, e: &ast::Expr, is_local: bool) -> (ValueRef
None => { }
Some(adj) => {
match *adj {
ty::AutoAddEnv(ty::ReStatic, ast::BorrowedSigil) => {
ty::AutoAddEnv(ty::RegionTraitStore(ty::ReStatic, _)) => {
let def = ty::resolve_expr(cx.tcx(), e);
let wrapper = closure::get_wrapper_for_bare_fn(cx,
ety_adjusted,
@ -200,13 +200,11 @@ pub fn const_expr(cx: &CrateContext, e: &ast::Expr, is_local: bool) -> (ValueRef
is_local);
llconst = C_struct(cx, [wrapper, C_null(Type::i8p(cx))], false)
}
ty::AutoAddEnv(ref r, ref s) => {
ty::AutoAddEnv(store) => {
cx.sess()
.span_bug(e.span,
format!("unexpected static function: region \
{:?} sigil {:?}",
*r,
*s))
format!("unexpected static function: {:?}",
store))
}
ty::AutoObject(..) => {
cx.sess()

8
src/librustc/middle/trans/debuginfo.rs
View File

@ -394,7 +394,7 @@ pub fn create_captured_var_metadata(bcx: &Block,
env_data_type: ty::t,
env_pointer: ValueRef,
env_index: uint,
closure_sigil: ast::Sigil,
closure_store: ty::TraitStore,
span: Span) {
if fn_should_be_ignored(bcx.fcx) {
return;
@ -443,11 +443,11 @@ pub fn create_captured_var_metadata(bcx: &Block,
llvm::LLVMDIBuilderCreateOpDeref(Type::i64(cx).to_ref())]
};
let address_op_count = match closure_sigil {
ast::BorrowedSigil => {
let address_op_count = match closure_store {
ty::RegionTraitStore(..) => {
address_operations.len()
}
ast::ManagedSigil | ast::OwnedSigil => {
ty::UniqTraitStore => {
address_operations.len() - 1
}
};

28
src/librustc/middle/trans/expr.rs
View File

@ -62,7 +62,7 @@ use middle::trans::type_of;
use middle::trans::write_guard;
use middle::ty::struct_fields;
use middle::ty::{AutoBorrowObj, AutoDerefRef, AutoAddEnv, AutoObject, AutoUnsafe};
use middle::ty::{AutoPtr, AutoBorrowVec, AutoBorrowVecRef, AutoBorrowFn};
use middle::ty::{AutoPtr, AutoBorrowVec, AutoBorrowVecRef};
use middle::ty;
use middle::typeck::MethodCall;
use util::common::indenter;
@ -200,14 +200,6 @@ fn apply_adjustments<'a>(bcx: &'a Block<'a>,
Some(AutoBorrowVecRef(..)) => {
unpack_datum!(bcx, auto_slice_and_ref(bcx, expr, datum))
}
Some(AutoBorrowFn(..)) => {
let adjusted_ty = ty::adjust_ty(bcx.tcx(), expr.span, expr.id, datum.ty,
Some(adjustment), |method_call| {
bcx.ccx().maps.method_map.borrow()
.find(&method_call).map(|method| method.ty)
});
unpack_datum!(bcx, auto_borrow_fn(bcx, adjusted_ty, datum))
}
Some(AutoBorrowObj(..)) => {
unpack_datum!(bcx, auto_borrow_obj(bcx, expr, datum))
}
@ -225,20 +217,6 @@ fn apply_adjustments<'a>(bcx: &'a Block<'a>,
debug!("after adjustments, datum={}", datum.to_str(bcx.ccx()));
return DatumBlock {bcx: bcx, datum: datum};
fn auto_borrow_fn<'a>(
bcx: &'a Block<'a>,
adjusted_ty: ty::t,
datum: Datum<Expr>)
-> DatumBlock<'a, Expr> {
// Currently, all closure types are represented precisely the
// same, so no runtime adjustment is required, but we still
// must patchup the type.
DatumBlock {bcx: bcx,
datum: Datum {val: datum.val,
ty: adjusted_ty,
kind: datum.kind}}
}
fn auto_slice<'a>(
bcx: &'a Block<'a>,
expr: &ast::Expr,
@ -731,10 +709,10 @@ fn trans_rvalue_dps_unadjusted<'a>(bcx: &'a Block<'a>,
ast::ExprFnBlock(decl, body) |
ast::ExprProc(decl, body) => {
let expr_ty = expr_ty(bcx, expr);
let sigil = ty::ty_closure_sigil(expr_ty);
let store = ty::ty_closure_store(expr_ty);
debug!("translating block function {} with type {}",
expr_to_str(expr), expr_ty.repr(tcx));
closure::trans_expr_fn(bcx, sigil, decl, body, expr.id, dest)
closure::trans_expr_fn(bcx, store, decl, body, expr.id, dest)
}
ast::ExprCall(f, ref args) => {
callee::trans_call(bcx, expr, f, callee::ArgExprs(args.as_slice()), dest)

2
src/librustc/middle/trans/glue.rs
View File

@ -323,7 +323,7 @@ fn make_drop_glue<'a>(bcx: &'a Block<'a>, v0: ValueRef, t: ty::t) -> &'a Block<'
bcx
})
}
ty::ty_closure(ref f) if f.sigil == ast::OwnedSigil => {
ty::ty_closure(ref f) if f.store == ty::UniqTraitStore => {
let box_cell_v = GEPi(bcx, v0, [0u, abi::fn_field_box]);
let env = Load(bcx, box_cell_v);
let env_ptr_ty = Type::at_box(bcx.ccx(), Type::i8(bcx.ccx())).ptr_to();

13
src/librustc/middle/trans/reflect.rs
View File

@ -218,7 +218,10 @@ impl<'a> Reflector<'a> {
// FIXME (#4809): visitor should break out bare fns from other fns
ty::ty_closure(ref fty) => {
let pureval = ast_fn_style_constant(fty.fn_style);
let sigilval = ast_sigil_constant(fty.sigil);
let sigilval = match fty.store {
ty::UniqTraitStore => 2u,
ty::RegionTraitStore(..) => 4u,
};
let retval = if ty::type_is_bot(fty.sig.output) {0u} else {1u};
let extra = vec!(self.c_uint(pureval),
self.c_uint(sigilval),
@ -397,14 +400,6 @@ pub fn emit_calls_to_trait_visit_ty<'a>(
return final;
}
pub fn ast_sigil_constant(sigil: ast::Sigil) -> uint {
match sigil {
ast::OwnedSigil => 2u,
ast::ManagedSigil => 3u,
ast::BorrowedSigil => 4u,
}
}
pub fn ast_fn_style_constant(fn_style: ast::FnStyle) -> uint {
match fn_style {
ast::UnsafeFn => 1u,

100
src/librustc/middle/ty.rs
View File

@ -214,7 +214,7 @@ pub enum Variance {
}
pub enum AutoAdjustment {
AutoAddEnv(ty::Region, ast::Sigil),
AutoAddEnv(ty::TraitStore),
AutoDerefRef(AutoDerefRef),
AutoObject(ty::TraitStore,
ty::BuiltinBounds,
@ -239,9 +239,6 @@ pub enum AutoRef {
/// Convert from ~[]/&[] to &&[] (or str)
AutoBorrowVecRef(Region, ast::Mutability),
/// Convert from @fn()/~fn()/|| to ||
AutoBorrowFn(Region),
/// Convert from T to *T
AutoUnsafe(ast::Mutability),
@ -430,9 +427,8 @@ pub struct BareFnTy {
#[deriving(Clone, Eq, TotalEq, Hash)]
pub struct ClosureTy {
pub fn_style: ast::FnStyle,
pub sigil: ast::Sigil,
pub onceness: ast::Onceness,
pub region: Region,
pub store: TraitStore,
pub bounds: BuiltinBounds,
pub sig: FnSig,
}
@ -801,7 +797,7 @@ pub enum type_err {
terr_onceness_mismatch(expected_found<Onceness>),
terr_abi_mismatch(expected_found<abi::Abi>),
terr_mutability,
terr_sigil_mismatch(expected_found<ast::Sigil>),
terr_sigil_mismatch(expected_found<TraitStore>),
terr_box_mutability,
terr_ptr_mutability,
terr_ref_mutability,
@ -1204,11 +1200,13 @@ pub fn mk_t(cx: &ctxt, st: sty) -> t {
&ty_param(_) => flags |= has_params as uint,
&ty_infer(_) => flags |= needs_infer as uint,
&ty_self(_) => flags |= has_self as uint,
&ty_enum(_, ref substs) | &ty_struct(_, ref substs) |
&ty_trait(~ty::TyTrait { ref substs, .. }) => {
&ty_enum(_, ref substs) | &ty_struct(_, ref substs) => {
flags |= sflags(substs);
match st {
ty_trait(~ty::TyTrait { store: RegionTraitStore(r, _), .. }) => {
}
&ty_trait(~ty::TyTrait { ref substs, store, .. }) => {
flags |= sflags(substs);
match store {
RegionTraitStore(r, _) => {
flags |= rflags(r);
}
_ => {}
@ -1232,7 +1230,12 @@ pub fn mk_t(cx: &ctxt, st: sty) -> t {
flags &= !(has_ty_bot as uint);
}
&ty_closure(ref f) => {
flags |= rflags(f.region);
match f.store {
RegionTraitStore(r, _) => {
flags |= rflags(r);
}
_ => {}
}
for a in f.sig.inputs.iter() { flags |= get(*a).flags; }
flags |= get(f.sig.output).flags;
// T -> _|_ is *not* _|_ !
@ -2217,17 +2220,7 @@ pub fn type_contents(cx: &ctxt, ty: t) -> TypeContents {
fn closure_contents(cx: &ctxt, cty: &ClosureTy) -> TypeContents {
// Closure contents are just like trait contents, but with potentially
// even more stuff.
let st = match cty.sigil {
ast::BorrowedSigil =>
object_contents(cx, RegionTraitStore(cty.region, MutMutable), cty.bounds),
ast::OwnedSigil => object_contents(cx, UniqTraitStore, cty.bounds),
ast::ManagedSigil => unreachable!()
};
// FIXME(#3569): This borrowed_contents call should be taken care of in
// object_contents, after ~Traits and @Traits can have region bounds too.
// This one here is redundant for &fns but important for ~fns and @fns.
let rt = borrowed_contents(cty.region, ast::MutImmutable);
let st = object_contents(cx, cty.store, cty.bounds);
// This also prohibits "@once fn" from being copied, which allows it to
// be called. Neither way really makes much sense.
@ -2236,7 +2229,7 @@ pub fn type_contents(cx: &ctxt, ty: t) -> TypeContents {
ast::Many => TC::None,
};
st | rt | ot
st | ot
}
fn object_contents(cx: &ctxt,
@ -2696,11 +2689,11 @@ pub fn ty_fn_args(fty: t) -> Vec<t> {
}
}
pub fn ty_closure_sigil(fty: t) -> Sigil {
pub fn ty_closure_store(fty: t) -> TraitStore {
match get(fty).sty {
ty_closure(ref f) => f.sigil,
ty_closure(ref f) => f.store,
ref s => {
fail!("ty_closure_sigil() called on non-closure type: {:?}", s)
fail!("ty_closure_store() called on non-closure type: {:?}", s)
}
}
}
@ -2838,15 +2831,14 @@ pub fn adjust_ty(cx: &ctxt,
return match adjustment {
Some(adjustment) => {
match *adjustment {
AutoAddEnv(r, s) => {
AutoAddEnv(store) => {
match ty::get(unadjusted_ty).sty {
ty::ty_bare_fn(ref b) => {
ty::mk_closure(
cx,
ty::ClosureTy {fn_style: b.fn_style,
sigil: s,
onceness: ast::Many,
region: r,
store: store,
bounds: ty::AllBuiltinBounds(),
sig: b.sig.clone()})
}
@ -2911,10 +2903,6 @@ pub fn adjust_ty(cx: &ctxt,
})
}
AutoBorrowFn(r) => {
borrow_fn(cx, span, r, adjusted_ty)
}
AutoUnsafe(m) => {
mk_ptr(cx, mt {ty: adjusted_ty, mutbl: m})
}
@ -2956,25 +2944,6 @@ pub fn adjust_ty(cx: &ctxt,
}
}
fn borrow_fn(cx: &ctxt, span: Span, r: Region, ty: ty::t) -> ty::t {
match get(ty).sty {
ty_closure(ref fty) => {
ty::mk_closure(cx, ClosureTy {
sigil: BorrowedSigil,
region: r,
..(**fty).clone()
})
}
ref s => {
cx.sess.span_bug(
span,
format!("borrow-fn associated with bad sty: {:?}",
s));
}
}
}
fn borrow_obj(cx: &ctxt, span: Span, r: Region,
m: ast::Mutability, ty: ty::t) -> ty::t {
match get(ty).sty {
@ -2998,7 +2967,6 @@ impl AutoRef {
ty::AutoPtr(r, m) => ty::AutoPtr(f(r), m),
ty::AutoBorrowVec(r, m) => ty::AutoBorrowVec(f(r), m),
ty::AutoBorrowVecRef(r, m) => ty::AutoBorrowVecRef(f(r), m),
ty::AutoBorrowFn(r) => ty::AutoBorrowFn(f(r)),
ty::AutoUnsafe(m) => ty::AutoUnsafe(m),
ty::AutoBorrowObj(r, m) => ty::AutoBorrowObj(f(r), m),
}
@ -4278,20 +4246,6 @@ pub fn eval_repeat_count<T: ExprTyProvider>(tcx: &T, count_expr: &ast::Expr) ->
}
}
// Determine what the style to check a nested function under
pub fn determine_inherited_style(parent: (ast::FnStyle, ast::NodeId),
child: (ast::FnStyle, ast::NodeId),
child_sigil: ast::Sigil)
-> (ast::FnStyle, ast::NodeId) {
// If the closure is a stack closure and hasn't had some non-standard
// style inferred for it, then check it under its parent's style.
// Otherwise, use its own
match child_sigil {
ast::BorrowedSigil if child.val0() == ast::NormalFn => parent,
_ => child
}
}
// Iterate over a type parameter's bounded traits and any supertraits
// of those traits, ignoring kinds.
// Here, the supertraits are the transitive closure of the supertrait
@ -4640,10 +4594,16 @@ pub fn hash_crate_independent(tcx: &ctxt, t: t, svh: &Svh) -> u64 {
ty_closure(ref c) => {
byte!(15);
hash!(c.fn_style);
hash!(c.sigil);
hash!(c.onceness);
hash!(c.bounds);
region(&mut state, c.region);
match c.store {
UniqTraitStore => byte!(0),
RegionTraitStore(r, m) => {
byte!(1)
region(&mut state, r);
assert_eq!(m, ast::MutMutable);
}
}
}
ty_trait(~ty::TyTrait { def_id: d, store, bounds, .. }) => {
byte!(17);

3
src/librustc/middle/ty_fold.rs
View File

@ -56,10 +56,9 @@ pub trait TypeFolder {
fty: &ty::ClosureTy)
-> ty::ClosureTy {
ty::ClosureTy {
region: self.fold_region(fty.region),
store: self.fold_trait_store(fty.store),
sig: self.fold_sig(&fty.sig),
fn_style: fty.fn_style,
sigil: fty.sigil,
onceness: fty.onceness,
bounds: fty.bounds,
}

84
src/librustc/middle/typeck/astconv.rs
View File

@ -112,7 +112,7 @@ pub fn ast_region_to_region(tcx: &ty::ctxt, lifetime: &ast::Lifetime)
r
}
fn opt_ast_region_to_region<AC:AstConv,RS:RegionScope>(
pub fn opt_ast_region_to_region<AC:AstConv,RS:RegionScope>(
this: &AC,
rscope: &RS,
default_span: Span,
@ -516,33 +516,42 @@ pub fn ast_ty_to_ty<AC:AstConv, RS:RegionScope>(
ty::mk_bare_fn(tcx, ty_of_bare_fn(this, ast_ty.id, bf.fn_style,
bf.abi, bf.decl))
}
ast::TyClosure(ref f) => {
if f.sigil == ast::ManagedSigil {
tcx.sess.span_err(ast_ty.span,
"managed closures are not supported");
}
ast::TyClosure(ref f, ref region) => {
// resolve the function bound region in the original region
// scope `rscope`, not the scope of the function parameters
let bound_region = opt_ast_region_to_region(this, rscope,
ast_ty.span, region);
let store = ty::RegionTraitStore(bound_region, ast::MutMutable);
// Use corresponding trait store to figure out default bounds
// if none were specified.
let bounds = conv_builtin_bounds(this.tcx(), &f.bounds, store);
let bounds = conv_builtin_bounds(this.tcx(), &f.bounds, match f.sigil {
// Use corresponding trait store to figure out default bounds
// if none were specified.
ast::BorrowedSigil => {
// dummy region
ty::RegionTraitStore(ty::ReEmpty, ast::MutMutable)
}
ast::OwnedSigil => ty::UniqTraitStore,
ast::ManagedSigil => return ty::mk_err()
});
let fn_decl = ty_of_closure(this,
rscope,
ast_ty.id,
f.sigil,
f.fn_style,
f.onceness,
bounds,
&f.region,
store,
f.decl,
None,
ast_ty.span);
None);
ty::mk_closure(tcx, fn_decl)
}
ast::TyProc(ref f) => {
// Use corresponding trait store to figure out default bounds
// if none were specified.
let bounds = conv_builtin_bounds(this.tcx(), &f.bounds, ty::UniqTraitStore);
let fn_decl = ty_of_closure(this,
ast_ty.id,
f.fn_style,
f.onceness,
bounds,
ty::UniqTraitStore,
f.decl,
None);
ty::mk_closure(tcx, fn_decl)
}
ast::TyPath(ref path, ref bounds, id) => {
@ -728,43 +737,19 @@ fn ty_of_method_or_bare_fn<AC:AstConv>(this: &AC, id: ast::NodeId,
};
}
pub fn ty_of_closure<AC:AstConv,RS:RegionScope>(
pub fn ty_of_closure<AC:AstConv>(
this: &AC,
rscope: &RS,
id: ast::NodeId,
sigil: ast::Sigil,
fn_style: ast::FnStyle,
onceness: ast::Onceness,
bounds: ty::BuiltinBounds,
opt_lifetime: &Option<ast::Lifetime>,
store: ty::TraitStore,
decl: &ast::FnDecl,
expected_sig: Option<ty::FnSig>,
span: Span)
expected_sig: Option<ty::FnSig>)
-> ty::ClosureTy
{
debug!("ty_of_fn_decl");
// resolve the function bound region in the original region
// scope `rscope`, not the scope of the function parameters
let bound_region = match opt_lifetime {
&Some(ref lifetime) => {
ast_region_to_region(this.tcx(), lifetime)
}
&None => {
match sigil {
ast::OwnedSigil | ast::ManagedSigil => {
// @fn(), ~fn() default to static as the bound
// on their upvars:
ty::ReStatic
}
ast::BorrowedSigil => {
// || defaults as normal for an omitted lifetime:
opt_ast_region_to_region(this, rscope, span, opt_lifetime)
}
}
}
};
// new region names that appear inside of the fn decl are bound to
// that function type
let rb = rscope::BindingRscope::new(id);
@ -791,9 +776,8 @@ pub fn ty_of_closure<AC:AstConv,RS:RegionScope>(
ty::ClosureTy {
fn_style: fn_style,
sigil: sigil,
onceness: onceness,
region: bound_region,
store: store,
bounds: bounds,
sig: ty::FnSig {binder_id: id,
inputs: input_tys,

66
src/librustc/middle/typeck/check/mod.rs
View File

@ -2116,7 +2116,7 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
fn check_expr_fn(fcx: &FnCtxt,
expr: &ast::Expr,
ast_sigil_opt: Option<ast::Sigil>,
store: ty::TraitStore,
decl: &ast::FnDecl,
body: ast::P<ast::Block>,
fn_kind: FnKind,
@ -2126,18 +2126,11 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
// Find the expected input/output types (if any). Substitute
// fresh bound regions for any bound regions we find in the
// expected types so as to avoid capture.
//
// Also try to pick up inferred style and sigil, defaulting
// to impure and block. Note that we only will use those for
// block syntax lambdas; that is, lambdas without explicit
// sigils.
let expected_sty = unpack_expected(fcx,
expected,
|x| Some((*x).clone()));
let error_happened = false;
let (expected_sig,
expected_style,
expected_sigil,
expected_onceness,
expected_bounds) = {
match expected_sty {
@ -2146,47 +2139,32 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
replace_late_bound_regions_in_fn_sig(
tcx, &cenv.sig,
|_| fcx.inh.infcx.fresh_bound_region(expr.id));
(Some(sig), cenv.fn_style, cenv.sigil,
cenv.onceness, cenv.bounds)
(Some(sig), cenv.onceness, cenv.bounds)
}
_ => {
// Not an error! Means we're inferring the closure type
let mut sigil = ast::BorrowedSigil;
let mut onceness = ast::Many;
let mut bounds = ty::EmptyBuiltinBounds();
match expr.node {
let onceness = match expr.node {
ast::ExprProc(..) => {
sigil = ast::OwnedSigil;
onceness = ast::Once;
bounds.add(ty::BoundSend);
ast::Once
}
_ => ()
}
(None, ast::NormalFn, sigil,
onceness, bounds)
_ => ast::Many
};
(None, onceness, bounds)
}
}
};
// If the proto is specified, use that, otherwise select a
// proto based on inference.
let (sigil, fn_style) = match ast_sigil_opt {
Some(p) => (p, ast::NormalFn),
None => (expected_sigil, expected_style)
};
// construct the function type
let fn_ty = astconv::ty_of_closure(fcx,
fcx.infcx(),
expr.id,
sigil,
fn_style,
ast::NormalFn,
expected_onceness,
expected_bounds,
&None,
store,
decl,
expected_sig,
expr.span);
expected_sig);
let fty_sig;
let fty = if error_happened {
@ -2198,9 +2176,8 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
};
ty::mk_err()
} else {
let fn_ty_copy = fn_ty.clone();
fty_sig = fn_ty.sig.clone();
ty::mk_closure(tcx, fn_ty_copy)
ty::mk_closure(tcx, fn_ty.clone())
};
debug!("check_expr_fn_with_unifier fty={}",
@ -2208,11 +2185,14 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
fcx.write_ty(expr.id, fty);
let (inherited_style, id) =
ty::determine_inherited_style((fcx.ps.borrow().fn_style,
fcx.ps.borrow().def),
(fn_style, expr.id),
sigil);
// If the closure is a stack closure and hasn't had some non-standard
// style inferred for it, then check it under its parent's style.
// Otherwise, use its own
let (inherited_style, id) = match store {
ty::RegionTraitStore(..) => (fcx.ps.borrow().fn_style,
fcx.ps.borrow().def),
ty::UniqTraitStore => (ast::NormalFn, expr.id)
};
check_fn(fcx.ccx, inherited_style, &fty_sig,
decl, id, body, fn_kind, fcx.inh);
@ -2856,9 +2836,13 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
_match::check_match(fcx, expr, discrim, arms.as_slice());
}
ast::ExprFnBlock(decl, body) => {
let region = astconv::opt_ast_region_to_region(fcx,
fcx.infcx(),
expr.span,
&None);
check_expr_fn(fcx,
expr,
Some(ast::BorrowedSigil),
ty::RegionTraitStore(region, ast::MutMutable),
decl,
body,
Vanilla,
@ -2867,7 +2851,7 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
ast::ExprProc(decl, body) => {
check_expr_fn(fcx,
expr,
Some(ast::OwnedSigil),
ty::UniqTraitStore,
decl,
body,
Vanilla,

24
src/librustc/middle/typeck/check/regionck.rs
View File

@ -133,7 +133,6 @@ use middle::typeck::MethodCall;
use middle::pat_util;
use util::ppaux::{ty_to_str, region_to_str, Repr};
use syntax::ast::{ManagedSigil, OwnedSigil, BorrowedSigil};
use syntax::ast::{DefArg, DefBinding, DefLocal, DefUpvar};
use syntax::ast;
use syntax::ast_util;
@ -175,9 +174,9 @@ fn region_of_def(fcx: &FnCtxt, def: ast::Def) -> ty::Region {
tcx.region_maps.var_region(node_id)
}
DefUpvar(_, subdef, closure_id, body_id) => {
match ty::ty_closure_sigil(fcx.node_ty(closure_id)) {
BorrowedSigil => region_of_def(fcx, *subdef),
ManagedSigil | OwnedSigil => ReScope(body_id)
match ty::ty_closure_store(fcx.node_ty(closure_id)) {
ty::RegionTraitStore(..) => region_of_def(fcx, *subdef),
ty::UniqTraitStore => ReScope(body_id)
}
}
_ => {
@ -611,7 +610,7 @@ fn check_expr_fn_block(rcx: &mut Rcx,
let function_type = rcx.resolve_node_type(expr.id);
match ty::get(function_type).sty {
ty::ty_closure(~ty::ClosureTy {
sigil: ast::BorrowedSigil, region: region, ..}) => {
store: ty::RegionTraitStore(region, _), ..}) => {
let freevars = freevars::get_freevars(tcx, expr.id);
if freevars.is_empty() {
// No free variables means that the environment
@ -635,7 +634,7 @@ fn check_expr_fn_block(rcx: &mut Rcx,
rcx.set_repeating_scope(repeating_scope);
match ty::get(function_type).sty {
ty::ty_closure(~ty::ClosureTy {sigil: ast::BorrowedSigil, ..}) => {
ty::ty_closure(~ty::ClosureTy {store: ty::RegionTraitStore(..), ..}) => {
let freevars = freevars::get_freevars(tcx, expr.id);
propagate_upupvar_borrow_kind(rcx, expr, freevars);
}
@ -749,8 +748,12 @@ fn constrain_callee(rcx: &mut Rcx,
match ty::get(callee_ty).sty {
ty::ty_bare_fn(..) => { }
ty::ty_closure(ref closure_ty) => {
let region = match closure_ty.store {
ty::RegionTraitStore(r, _) => r,
ty::UniqTraitStore => ty::ReStatic
};
rcx.fcx.mk_subr(true, infer::InvokeClosure(callee_expr.span),
call_region, closure_ty.region);
call_region, region);
}
_ => {
// this should not happen, but it does if the program is
@ -1120,13 +1123,8 @@ fn link_autoref(rcx: &mut Rcx,
link_region(mc.typer, expr.span, r, m, cmt_index);
}
ty::AutoBorrowFn(r) => {
let cmt_deref = mc.cat_deref_fn_or_obj(expr, expr_cmt, 0);
link_region(mc.typer, expr.span, r, ast::MutImmutable, cmt_deref);
}
ty::AutoBorrowObj(r, m) => {
let cmt_deref = mc.cat_deref_fn_or_obj(expr, expr_cmt, 0);
let cmt_deref = mc.cat_deref_obj(expr, expr_cmt);
link_region(mc.typer, expr.span, r, m, cmt_deref);
}

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

@ -141,7 +141,11 @@ fn resolve_type_vars_for_node(wbcx: &mut WbCtxt, sp: Span, id: ast::NodeId)
Some(adjustment) => {
match *adjustment {
ty::AutoAddEnv(r, s) => {
ty::AutoAddEnv(store) => {
let r = match store {
ty::RegionTraitStore(r, _) => r,
ty::UniqTraitStore => ty::ReStatic
};
match resolve_region(fcx.infcx(),
r,
resolve_all | force_all) {
@ -166,7 +170,12 @@ fn resolve_type_vars_for_node(wbcx: &mut WbCtxt, sp: Span, id: ast::NodeId)
"cannot coerce non-statically resolved bare fn")
}
let resolved_adj = @ty::AutoAddEnv(r1, s);
let resolved_adj = @ty::AutoAddEnv(match store {
ty::RegionTraitStore(..) => {
ty::RegionTraitStore(r1, ast::MutMutable)
}
ty::UniqTraitStore => ty::UniqTraitStore
});
debug!("Adjustments for node {}: {:?}",
id, resolved_adj);
tcx.adjustments.borrow_mut().insert(id, resolved_adj);

34
src/librustc/middle/typeck/infer/coercion.rs
View File

@ -65,8 +65,7 @@ we may want to adjust precisely when coercions occur.
*/
use middle::ty::{AutoPtr, AutoBorrowVec, AutoBorrowFn, AutoBorrowObj};
use middle::ty::{AutoDerefRef};
use middle::ty::{AutoPtr, AutoBorrowVec, AutoBorrowObj, AutoDerefRef};
use middle::ty::{VstoreSlice, VstoreUniq};
use middle::ty::{mt};
use middle::ty;
@ -120,7 +119,7 @@ impl<'f> Coerce<'f> {
});
}
ty::ty_closure(~ty::ClosureTy {sigil: ast::BorrowedSigil, ..}) => {
ty::ty_closure(~ty::ClosureTy {store: ty::RegionTraitStore(..), ..}) => {
return self.unpack_actual_value(a, |sty_a| {
self.coerce_borrowed_fn(a, sty_a, b)
});
@ -342,33 +341,14 @@ impl<'f> Coerce<'f> {
a.inf_str(self.get_ref().infcx), sty_a,
b.inf_str(self.get_ref().infcx));
let fn_ty = match *sty_a {
ty::ty_closure(ref f) if f.sigil == ast::ManagedSigil ||
f.sigil == ast::OwnedSigil => {
(*f).clone()
}
match *sty_a {
ty::ty_bare_fn(ref f) => {
return self.coerce_from_bare_fn(a, f, b);
self.coerce_from_bare_fn(a, f, b)
}
_ => {
return self.subtype(a, b);
self.subtype(a, b)
}
};
let r_borrow = self.get_ref().infcx.next_region_var(Coercion(self.get_ref().trace));
let a_borrowed = ty::mk_closure(
self.get_ref().infcx.tcx,
ty::ClosureTy {
sigil: ast::BorrowedSigil,
region: r_borrow,
.. *fn_ty
});
if_ok!(self.subtype(a_borrowed, b));
Ok(Some(@AutoDerefRef(AutoDerefRef {
autoderefs: 0,
autoref: Some(AutoBorrowFn(r_borrow))
})))
}
}
fn coerce_from_bare_fn(&self, a: ty::t, fn_ty_a: &ty::BareFnTy, b: ty::t)
@ -393,7 +373,7 @@ impl<'f> Coerce<'f> {
_ => return self.subtype(a, b)
};
let adj = @ty::AutoAddEnv(fn_ty_b.region, fn_ty_b.sigil);
let adj = @ty::AutoAddEnv(fn_ty_b.store);
let a_closure = ty::mk_closure(self.get_ref().infcx.tcx,
ty::ClosureTy {
sig: fn_ty_a.sig.clone(),

38
src/librustc/middle/typeck/infer/combine.rs
View File

@ -205,18 +205,32 @@ pub trait Combine {
fn closure_tys(&self, a: &ty::ClosureTy,
b: &ty::ClosureTy) -> cres<ty::ClosureTy> {
let p = if_ok!(self.sigils(a.sigil, b.sigil));
let r = if_ok!(self.contraregions(a.region, b.region));
let store = match (a.store, b.store) {
(ty::RegionTraitStore(a_r, a_m),
ty::RegionTraitStore(b_r, b_m)) if a_m == b_m => {
let r = if_ok!(self.contraregions(a_r, b_r));
ty::RegionTraitStore(r, a_m)
}
_ if a.store == b.store => {
a.store
}
_ => {
return Err(ty::terr_sigil_mismatch(expected_found(self, a.store, b.store)))
}
};
let fn_style = if_ok!(self.fn_styles(a.fn_style, b.fn_style));
let onceness = if_ok!(self.oncenesses(a.onceness, b.onceness));
let bounds = if_ok!(self.bounds(a.bounds, b.bounds));
let sig = if_ok!(self.fn_sigs(&a.sig, &b.sig));
Ok(ty::ClosureTy {fn_style: fn_style,
sigil: p,
onceness: onceness,
region: r,
bounds: bounds,
sig: sig})
Ok(ty::ClosureTy {
fn_style: fn_style,
onceness: onceness,
store: store,
bounds: bounds,
sig: sig
})
}
fn fn_sigs(&self, a: &ty::FnSig, b: &ty::FnSig) -> cres<ty::FnSig>;
@ -238,14 +252,6 @@ pub trait Combine {
self.contratys(a, b).and_then(|t| Ok(t))
}
fn sigils(&self, p1: ast::Sigil, p2: ast::Sigil) -> cres<ast::Sigil> {
if p1 == p2 {
Ok(p1)
} else {
Err(ty::terr_sigil_mismatch(expected_found(self, p1, p2)))
}
}
fn fn_styles(&self, a: FnStyle, b: FnStyle) -> cres<FnStyle>;
fn abi(&self, a: abi::Abi, b: abi::Abi) -> cres<abi::Abi> {

6
src/librustc/middle/typeck/variance.rs
View File

@ -704,11 +704,13 @@ impl<'a> ConstraintContext<'a> {
self.add_constraint(index, variance);
}
ty::ty_bare_fn(ty::BareFnTy { sig: ref sig, .. }) => {
ty::ty_bare_fn(ty::BareFnTy { ref sig, .. }) |
ty::ty_closure(~ty::ClosureTy { ref sig, store: ty::UniqTraitStore, .. }) => {
self.add_constraints_from_sig(sig, variance);
}
ty::ty_closure(~ty::ClosureTy { sig: ref sig, region, .. }) => {
ty::ty_closure(~ty::ClosureTy { ref sig,
store: ty::RegionTraitStore(region, _), .. }) => {
let contra = self.contravariant(variance);
self.add_constraints_from_region(region, contra);
self.add_constraints_from_sig(sig, variance);

62
src/librustc/util/ppaux.rs
View File

@ -266,21 +266,11 @@ pub fn ty_to_str(cx: &ctxt, typ: t) -> ~str {
}
fn closure_to_str(cx: &ctxt, cty: &ty::ClosureTy) -> ~str {
let is_proc =
(cty.sigil, cty.onceness) == (ast::OwnedSigil, ast::Once);
let is_borrowed_closure = cty.sigil == ast::BorrowedSigil;
let mut s = StrBuf::new();
let mut s = if is_proc || is_borrowed_closure {
StrBuf::new()
} else {
StrBuf::from_owned_str(cty.sigil.to_str())
};
match (cty.sigil, cty.region) {
(ast::ManagedSigil, ty::ReStatic) |
(ast::OwnedSigil, ty::ReStatic) => {}
(_, region) => {
match cty.store {
ty::UniqTraitStore => {}
ty::RegionTraitStore(region, _) => {
s.push_str(region_to_str(cx, "", true, region));
}
}
@ -293,40 +283,24 @@ pub fn ty_to_str(cx: &ctxt, typ: t) -> ~str {
}
};
if is_proc {
s.push_str("proc");
} else {
match cty.onceness {
ast::Many => {}
ast::Once => {
s.push_str(cty.onceness.to_str());
s.push_char(' ');
match cty.store {
ty::UniqTraitStore => {
assert_eq!(cty.onceness, ast::Once);
s.push_str("proc");
push_sig_to_str(cx, &mut s, '(', ')', &cty.sig);
}
ty::RegionTraitStore(..) => {
match cty.onceness {
ast::Many => {}
ast::Once => s.push_str("once ")
}
};
if !is_borrowed_closure {
s.push_str("fn");
push_sig_to_str(cx, &mut s, '|', '|', &cty.sig);
}
}
if !is_borrowed_closure {
// Print bounds before `fn` if this is not a borrowed closure.
if !cty.bounds.is_empty() {
s.push_str(":");
s.push_str(cty.bounds.repr(cx));
}
push_sig_to_str(cx, &mut s, '(', ')', &cty.sig);
} else {
// Print bounds after the signature if this is a borrowed closure.
push_sig_to_str(cx, &mut s, '|', '|', &cty.sig);
if is_borrowed_closure {
if !cty.bounds.is_empty() {
s.push_str(":");
s.push_str(cty.bounds.repr(cx));
}
}
if !cty.bounds.is_empty() {
s.push_str(":");
s.push_str(cty.bounds.repr(cx));
}
s.into_owned()

10
src/librustdoc/clean.rs
View File

@ -474,8 +474,6 @@ impl Clean<Item> for doctree::Function {
#[deriving(Clone, Encodable, Decodable)]
pub struct ClosureDecl {
pub sigil: ast::Sigil,
pub region: Option<Lifetime>,
pub lifetimes: Vec<Lifetime>,
pub decl: FnDecl,
pub onceness: ast::Onceness,
@ -486,8 +484,6 @@ pub struct ClosureDecl {
impl Clean<ClosureDecl> for ast::ClosureTy {
fn clean(&self) -> ClosureDecl {
ClosureDecl {
sigil: self.sigil,
region: self.region.clean(),
lifetimes: self.lifetimes.clean().move_iter().collect(),
decl: self.decl.clean(),
onceness: self.onceness,
@ -652,7 +648,8 @@ pub enum Type {
Self(ast::NodeId),
/// Primitives are just the fixed-size numeric types (plus int/uint/float), and char.
Primitive(ast::PrimTy),
Closure(~ClosureDecl),
Closure(~ClosureDecl, Option<Lifetime>),
Proc(~ClosureDecl),
/// extern "ABI" fn
BareFunction(~BareFunctionDecl),
Tuple(Vec<Type> ),
@ -706,7 +703,8 @@ impl Clean<Type> for ast::Ty {
tpbs.clean().map(|x| x.move_iter().collect()),
id)
}
TyClosure(ref c) => Closure(~c.clean()),
TyClosure(ref c, region) => Closure(~c.clean(), region.clean()),
TyProc(ref c) => Proc(~c.clean()),
TyBareFn(ref barefn) => BareFunction(~barefn.clean()),
TyBot => Bottom,
ref x => fail!("Unimplemented type {:?}", x),

21
src/librustdoc/html/format.rs
View File

@ -337,19 +337,24 @@ impl fmt::Show for clean::Type {
};
f.buf.write(s.as_bytes())
}
clean::Closure(ref decl) => {
let region = match decl.region {
clean::Closure(ref decl, ref region) => {
let region = match *region {
Some(ref region) => format!("{} ", *region),
None => ~"",
};
write!(f.buf, "{}{}{arrow, select, yes{ -&gt; {ret}} other{}}",
write!(f.buf, "{}{}|{}|{arrow, select, yes{ -&gt; {ret}} other{}}",
FnStyleSpace(decl.fn_style),
match decl.sigil {
ast::OwnedSigil => format!("proc({})", decl.decl.inputs),
ast::BorrowedSigil => format!("{}|{}|", region, decl.decl.inputs),
ast::ManagedSigil => format!("@{}fn({})", region, decl.decl.inputs),
},
region,
decl.decl.inputs,
arrow = match decl.decl.output { clean::Unit => "no", _ => "yes" },
ret = decl.decl.output)
// FIXME: where are bounds and lifetimes printed?!
}
clean::Proc(ref decl) => {
write!(f.buf, "{}proc({}){arrow, select, yes{ -&gt; {ret}} other{}}",
FnStyleSpace(decl.fn_style),
decl.decl.inputs,
arrow = match decl.decl.output { clean::Unit => "no", _ => "yes" },
ret = decl.decl.output)
// FIXME: where are bounds and lifetimes printed?!

22
src/libsyntax/ast.rs
View File

@ -359,23 +359,6 @@ pub enum Mutability {
MutImmutable,
}
#[deriving(Clone, Eq, TotalEq, Encodable, Decodable, Hash)]
pub enum Sigil {
BorrowedSigil,
OwnedSigil,
ManagedSigil
}
impl fmt::Show for Sigil {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
BorrowedSigil => "&".fmt(f),
OwnedSigil => "~".fmt(f),
ManagedSigil => "@".fmt(f),
}
}
}
#[deriving(Clone, Eq, TotalEq, Encodable, Decodable, Hash)]
pub enum ExprVstore {
ExprVstoreUniq, // ~[1,2,3,4]
@ -791,8 +774,6 @@ impl fmt::Show for Onceness {
#[deriving(Eq, TotalEq, Encodable, Decodable, Hash)]
pub struct ClosureTy {
pub sigil: Sigil,
pub region: Option<Lifetime>,
pub lifetimes: Vec<Lifetime>,
pub fn_style: FnStyle,
pub onceness: Onceness,
@ -822,7 +803,8 @@ pub enum Ty_ {
TyFixedLengthVec(P<Ty>, @Expr),
TyPtr(MutTy),
TyRptr(Option<Lifetime>, MutTy),
TyClosure(@ClosureTy),
TyClosure(@ClosureTy, Option<Lifetime>),
TyProc(@ClosureTy),
TyBareFn(@BareFnTy),
TyTup(Vec<P<Ty>> ),
TyPath(Path, Option<OwnedSlice<TyParamBound>>, NodeId), // for #7264; see above

13
src/libsyntax/fold.rs
View File

@ -155,11 +155,18 @@ pub trait Folder {
TyRptr(ref region, ref mt) => {
TyRptr(fold_opt_lifetime(region, self), fold_mt(mt, self))
}
TyClosure(ref f) => {
TyClosure(ref f, ref region) => {
TyClosure(@ClosureTy {
sigil: f.sigil,
fn_style: f.fn_style,
region: fold_opt_lifetime(&f.region, self),
onceness: f.onceness,
bounds: fold_opt_bounds(&f.bounds, self),
decl: self.fold_fn_decl(f.decl),
lifetimes: f.lifetimes.iter().map(|l| fold_lifetime(l, self)).collect(),
}, fold_opt_lifetime(region, self))
}
TyProc(ref f) => {
TyProc(@ClosureTy {
fn_style: f.fn_style,
onceness: f.onceness,
bounds: fold_opt_bounds(&f.bounds, self),
decl: self.fold_fn_decl(f.decl),

32
src/libsyntax/parse/parser.rs
View File

@ -11,7 +11,6 @@
#![macro_escape]
use abi;
use ast::{Sigil, BorrowedSigil, ManagedSigil, OwnedSigil};
use ast::{BareFnTy, ClosureTy};
use ast::{RegionTyParamBound, TraitTyParamBound};
use ast::{Provided, Public, FnStyle};
@ -49,8 +48,8 @@ use ast::StrStyle;
use ast::{SelfRegion, SelfStatic, SelfUniq, SelfValue};
use ast::{TokenTree, TraitMethod, TraitRef, TTDelim, TTSeq, TTTok};
use ast::{TTNonterminal, TupleVariantKind, Ty, Ty_, TyBot, TyBox};
use ast::{TypeField, TyFixedLengthVec, TyClosure, TyBareFn, TyTypeof};
use ast::{TyInfer, TypeMethod};
use ast::{TypeField, TyFixedLengthVec, TyClosure, TyProc, TyBareFn};
use ast::{TyTypeof, TyInfer, TypeMethod};
use ast::{TyNil, TyParam, TyParamBound, TyPath, TyPtr, TyRptr};
use ast::{TyTup, TyU32, TyUniq, TyVec, UnUniq};
use ast::{UnnamedField, UnsafeBlock, UnsafeFn, ViewItem};
@ -923,9 +922,7 @@ impl<'a> Parser<'a> {
cf: ret_style,
variadic: variadic
});
TyClosure(@ClosureTy {
sigil: OwnedSigil,
region: None,
TyProc(@ClosureTy {
fn_style: NormalFn,
onceness: Once,
bounds: bounds,
@ -984,14 +981,12 @@ impl<'a> Parser<'a> {
});
TyClosure(@ClosureTy {
sigil: BorrowedSigil,
region: region,
fn_style: fn_style,
onceness: onceness,
bounds: bounds,
decl: decl,
lifetimes: lifetimes,
})
}, region)
}
pub fn parse_unsafety(&mut self) -> FnStyle {
@ -1201,11 +1196,11 @@ impl<'a> Parser<'a> {
} else if self.token == token::AT {
// MANAGED POINTER
self.bump();
self.parse_box_or_uniq_pointee(ManagedSigil)
TyBox(self.parse_ty(false))
} else if self.token == token::TILDE {
// OWNED POINTER
self.bump();
self.parse_box_or_uniq_pointee(OwnedSigil)
TyUniq(self.parse_ty(false))
} else if self.token == token::BINOP(token::STAR) {
// STAR POINTER (bare pointer?)
self.bump();
@ -1271,21 +1266,6 @@ impl<'a> Parser<'a> {
P(Ty {id: ast::DUMMY_NODE_ID, node: t, span: sp})
}
// parse the type following a @ or a ~
pub fn parse_box_or_uniq_pointee(&mut self,
sigil: ast::Sigil)
-> Ty_ {
// other things are parsed as @/~ + a type. Note that constructs like
// ~[] and ~str will be resolved during typeck to slices and so forth,
// rather than boxed ptrs. But the special casing of str/vec is not
// reflected in the AST type.
if sigil == OwnedSigil {
TyUniq(self.parse_ty(false))
} else {
TyBox(self.parse_ty(false))
}
}
pub fn parse_borrowed_pointee(&mut self) -> Ty_ {
// look for `&'lt` or `&'foo ` and interpret `foo` as the region name:
let opt_lifetime = self.parse_opt_lifetime();

48
src/libsyntax/print/pprust.rs
View File

@ -483,14 +483,23 @@ impl<'a> State<'a> {
f.fn_style, ast::Many, f.decl, None, &None,
Some(&generics), None));
}
ast::TyClosure(f) => {
ast::TyClosure(f, ref region) => {
let generics = ast::Generics {
lifetimes: f.lifetimes.clone(),
ty_params: OwnedSlice::empty()
};
try!(self.print_ty_fn(None, Some(f.sigil), &f.region,
f.fn_style, f.onceness, f.decl, None, &f.bounds,
Some(&generics), None));
try!(self.print_ty_fn(None, Some('&'), region, f.fn_style,
f.onceness, f.decl, None, &f.bounds,
Some(&generics), None));
}
ast::TyProc(f) => {
let generics = ast::Generics {
lifetimes: f.lifetimes.clone(),
ty_params: OwnedSlice::empty()
};
try!(self.print_ty_fn(None, Some('~'), &None, f.fn_style,
f.onceness, f.decl, None, &f.bounds,
Some(&generics), None));
}
ast::TyPath(ref path, ref bounds, _) => {
try!(self.print_bounded_path(path, bounds));
@ -1716,8 +1725,7 @@ impl<'a> State<'a> {
opt_explicit_self: Option<ast::ExplicitSelf_>,
vis: ast::Visibility) -> IoResult<()> {
try!(self.head(""));
try!(self.print_fn_header_info(opt_explicit_self, fn_style, abi,
ast::Many, None, vis));
try!(self.print_fn_header_info(opt_explicit_self, fn_style, abi, vis));
try!(self.nbsp());
try!(self.print_ident(name));
try!(self.print_generics(generics));
@ -2023,7 +2031,7 @@ impl<'a> State<'a> {
pub fn print_ty_fn(&mut self,
opt_abi: Option<abi::Abi>,
opt_sigil: Option<ast::Sigil>,
opt_sigil: Option<char>,
opt_region: &Option<ast::Lifetime>,
fn_style: ast::FnStyle,
onceness: ast::Onceness,
@ -2037,15 +2045,15 @@ impl<'a> State<'a> {
// Duplicates the logic in `print_fn_header_info()`. This is because that
// function prints the sigil in the wrong place. That should be fixed.
if opt_sigil == Some(ast::OwnedSigil) && onceness == ast::Once {
if opt_sigil == Some('~') && onceness == ast::Once {
try!(word(&mut self.s, "proc"));
} else if opt_sigil == Some(ast::BorrowedSigil) {
} else if opt_sigil == Some('&') {
try!(self.print_extern_opt_abi(opt_abi));
try!(self.print_fn_style(fn_style));
try!(self.print_onceness(onceness));
} else {
assert!(opt_sigil.is_none());
try!(self.print_opt_abi_and_extern_if_nondefault(opt_abi));
try!(self.print_opt_sigil(opt_sigil));
try!(self.print_fn_style(fn_style));
try!(self.print_onceness(onceness));
try!(word(&mut self.s, "fn"));
@ -2062,7 +2070,7 @@ impl<'a> State<'a> {
match generics { Some(g) => try!(self.print_generics(g)), _ => () }
try!(zerobreak(&mut self.s));
if opt_sigil == Some(ast::BorrowedSigil) {
if opt_sigil == Some('&') {
try!(word(&mut self.s, "|"));
} else {
try!(self.popen());
@ -2070,7 +2078,7 @@ impl<'a> State<'a> {
try!(self.print_fn_args(decl, opt_explicit_self));
if opt_sigil == Some(ast::BorrowedSigil) {
if opt_sigil == Some('&') {
try!(word(&mut self.s, "|"));
} else {
if decl.variadic {
@ -2327,22 +2335,10 @@ impl<'a> State<'a> {
}
}
pub fn print_opt_sigil(&mut self,
opt_sigil: Option<ast::Sigil>) -> IoResult<()> {
match opt_sigil {
Some(ast::BorrowedSigil) => word(&mut self.s, "&"),
Some(ast::OwnedSigil) => word(&mut self.s, "~"),
Some(ast::ManagedSigil) => word(&mut self.s, "@"),
None => Ok(())
}
}
pub fn print_fn_header_info(&mut self,
_opt_explicit_self: Option<ast::ExplicitSelf_>,
opt_fn_style: Option<ast::FnStyle>,
abi: abi::Abi,
onceness: ast::Onceness,
opt_sigil: Option<ast::Sigil>,
vis: ast::Visibility) -> IoResult<()> {
try!(word(&mut self.s, visibility_qualified(vis, "")));
@ -2357,9 +2353,7 @@ impl<'a> State<'a> {
try!(self.print_opt_fn_style(opt_fn_style));
}
try!(self.print_onceness(onceness));
try!(word(&mut self.s, "fn"));
self.print_opt_sigil(opt_sigil)
word(&mut self.s, "fn")
}
pub fn print_fn_style(&mut self, s: ast::FnStyle) -> IoResult<()> {

15
src/libsyntax/visit.rs
View File

@ -328,7 +328,7 @@ pub fn walk_ty<E: Clone, V: Visitor<E>>(visitor: &mut V, typ: &Ty, env: E) {
visitor.visit_ty(tuple_element_type, env.clone())
}
}
TyClosure(ref function_declaration) => {
TyClosure(ref function_declaration, ref region) => {
for argument in function_declaration.decl.inputs.iter() {
visitor.visit_ty(argument.ty, env.clone())
}
@ -338,11 +338,22 @@ pub fn walk_ty<E: Clone, V: Visitor<E>>(visitor: &mut V, typ: &Ty, env: E) {
}
visitor.visit_opt_lifetime_ref(
typ.span,
&function_declaration.region,
region,
env.clone());
walk_lifetime_decls(visitor, &function_declaration.lifetimes,
env.clone());
}
TyProc(ref function_declaration) => {
for argument in function_declaration.decl.inputs.iter() {
visitor.visit_ty(argument.ty, env.clone())
}
visitor.visit_ty(function_declaration.decl.output, env.clone());
for bounds in function_declaration.bounds.iter() {
walk_ty_param_bounds(visitor, bounds, env.clone())
}
walk_lifetime_decls(visitor, &function_declaration.lifetimes,
env.clone());
}
TyBareFn(ref function_declaration) => {
for argument in function_declaration.decl.inputs.iter() {
visitor.visit_ty(argument.ty, env.clone())