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Resolve type variables when checking casting to char

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This commit is contained in:
Seo Sanghyeon 2014-02-13 00:42:28 +09:00 • committed by Alex Crichton
parent 745aa7482a
commit 606c23a789
2 changed files with 14 additions and 0 deletions
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1
src/librustc/middle/typeck/check/mod.rs
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@ -3035,6 +3035,7 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
if type_is_c_like_enum(fcx, expr.span, t_e) && t_1_is_trivial { if type_is_c_like_enum(fcx, expr.span, t_e) && t_1_is_trivial {
// casts from C-like enums are allowed // casts from C-like enums are allowed
} else if t_1_is_char { } else if t_1_is_char {
let te = fcx.infcx().resolve_type_vars_if_possible(te);
if ty::get(te).sty != ty::ty_uint(ast::TyU8) { if ty::get(te).sty != ty::ty_uint(ast::TyU8) {
fcx.type_error_message(expr.span, |actual| { fcx.type_error_message(expr.span, |actual| {
format!("only `u8` can be cast as `char`, not `{}`", actual) format!("only `u8` can be cast as `char`, not `{}`", actual)

13
src/test/run-pass/issue-9918.rs Normal file
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@ -0,0 +1,13 @@
// 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.
pub fn main() {
assert_eq!((0 + 0u8) as char, '\0');
}