Don't allow single-variant enums to be dereferenced. #6246
I'm not sure if this was even intentional at this point.
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@ -540,19 +540,6 @@ impl<'a> PrivacyVisitor<'a> {
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return false;
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}
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// Checks that a dereference of a univariant enum can occur.
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fn check_variant(&self, span: Span, enum_id: ast::DefId) {
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let variant_info = ty::enum_variants(self.tcx, enum_id)[0];
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match self.def_privacy(variant_info.id) {
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Allowable => {}
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ExternallyDenied | DisallowedBy(..) => {
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self.tcx.sess.span_err(span, "can only dereference enums \
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with a single, public variant");
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}
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}
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}
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// Checks that a field is in scope.
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// FIXME #6993: change type (and name) from Ident to Name
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fn check_field(&mut self, span: Span, id: ast::DefId, ident: ast::Ident) {
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@ -713,18 +700,6 @@ impl<'a> Visitor<()> for PrivacyVisitor<'a> {
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struct type?!"),
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}
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}
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ast::ExprUnary(_, ast::UnDeref, operand) => {
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// In *e, we need to check that if e's type is an
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// enum type t, then t's first variant is public or
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// privileged. (We can assume it has only one variant
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// since typeck already happened.)
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match ty::get(ty::expr_ty(self.tcx, operand)).sty {
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ty::ty_enum(id, _) => {
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self.check_variant(expr.span, id);
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}
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_ => { /* No check needed */ }
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}
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}
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_ => {}
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}
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@ -628,37 +628,6 @@ impl Datum {
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ty::ty_rptr(_, mt) => {
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return (Some(deref_ptr(bcx, self, mt.ty)), bcx);
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}
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ty::ty_enum(did, ref substs) => {
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// Check whether this enum is a newtype enum:
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let variants = ty::enum_variants(ccx.tcx, did);
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if (*variants).len() != 1 || variants[0].args.len() != 1 {
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return (None, bcx);
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}
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let repr = adt::represent_type(ccx, self.ty);
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let ty = ty::subst(ccx.tcx, substs, variants[0].args[0]);
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return match self.mode {
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ByRef(_) => {
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// Recast lv.val as a pointer to the newtype
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// rather than a ptr to the enum type.
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(
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Some(Datum {
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val: adt::trans_field_ptr(bcx, repr, self.val,
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0, 0),
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ty: ty,
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mode: ByRef(ZeroMem)
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}),
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bcx
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)
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}
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ByValue => {
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// Actually, this case cannot happen right
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// now, because enums are never immediate.
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assert!(type_is_immediate(bcx.ccx(), ty));
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(Some(Datum {ty: ty, ..*self}), bcx)
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}
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};
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}
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ty::ty_struct(did, ref substs) => {
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// Check whether this struct is a newtype struct.
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let fields = ty::struct_fields(ccx.tcx, did, substs);
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@ -2631,16 +2631,6 @@ pub fn deref_sty(cx: ctxt, sty: &sty, explicit: bool) -> Option<mt> {
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Some(mt)
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}
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ty_enum(did, ref substs) => {
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let variants = enum_variants(cx, did);
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if (*variants).len() == 1u && variants[0].args.len() == 1u {
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let v_t = subst(cx, substs, variants[0].args[0]);
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Some(mt {ty: v_t, mutbl: ast::MutImmutable})
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} else {
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None
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}
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}
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ty_struct(did, ref substs) => {
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let fields = struct_fields(cx, did, substs);
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if fields.len() == 1 && fields[0].ident ==
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@ -2765,12 +2765,6 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
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}
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None => {
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match *sty {
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ty::ty_enum(..) => {
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tcx.sess.span_err(
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expr.span,
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"can only dereference enums with a single variant which \
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has a single argument");
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}
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ty::ty_struct(..) => {
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tcx.sess.span_err(
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expr.span,
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@ -1,24 +0,0 @@
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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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mod ctr {
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pub enum ctr { priv mkCtr(int) }
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pub fn new(i: int) -> ctr { mkCtr(i) }
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pub fn inc(c: ctr) -> ctr { mkCtr(*c + 1) }
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}
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fn main() {
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let c = ctr::new(42);
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let c2 = ctr::inc(c);
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assert!(*c2 == 5); //~ ERROR can only dereference enums with a single, public variant
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}
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@ -32,7 +32,9 @@ fn linear_map<K,V>() -> HashMap<K,V> {
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impl<K,V> HashMap<K,V> {
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pub fn len(&mut self) -> uint {
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self.size
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match *self {
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HashMap_(l) => l.size
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}
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}
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}
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