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rustc: Add error about obsolete struct deref

This commit is contained in:
Brian Anderson 2013-12-30 16:39:52 -08:00
parent 3b1862a82f
commit 2d8fbba57d
2 changed files with 25 additions and 0 deletions
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10
src/librustc/middle/typeck/check/mod.rs
View File

@ -2765,6 +2765,16 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
}
None => {
match *sty {
ty::ty_struct(did, ref substs) if {
let fields = ty::struct_fields(fcx.tcx(), did, substs);
fields.len() == 1
&& fields[0].ident == token::special_idents::unnamed_field
} => {
// This is an obsolete struct deref
tcx.sess.span_err(
expr.span,
"single-field tuple-structs can no longer be dereferenced");
}
_ => {
fcx.type_error_message(expr.span,
|actual| {

15
src/test/compile-fail/obsolete-tuple-struct-deref.rs Normal file
View File

@ -0,0 +1,15 @@
// 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.
fn main() {
struct S(int);
let s = S(0);
let x = *s; //~ ERROR single-field tuple-structs can no longer be dereferenced
}