42 lines
1.3 KiB
Rust
42 lines
1.3 KiB
Rust
// Copyright 2015 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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#![feature(rustc_attrs)]
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#![allow(dead_code, unused_variables)]
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// Issue #21633: reject duplicate loop labels in function bodies.
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//
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// Test rejection of lifetimes in *expressions* that shadow loop labels.
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fn foo() {
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// Reusing lifetime `'a` in function item is okay.
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fn foo<'a>(x: &'a i8) -> i8 { *x }
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// So is reusing `'a` in struct item
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struct S1<'a> { x: &'a i8 } impl<'a> S1<'a> { fn m(&self) {} }
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// and a method item
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struct S2; impl S2 { fn m<'a>(&self) {} }
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let z = 3_i8;
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'a: loop { //~ NOTE shadowed label `'a` declared here
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let b = Box::new(|x: &i8| *x) as Box<for <'a> Fn(&'a i8) -> i8>;
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//~^ WARN lifetime name `'a` shadows a label name that is already in scope
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assert_eq!((*b)(&z), z);
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break 'a;
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}
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}
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#[rustc_error]
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pub fn main() { //~ ERROR compilation successful
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foo();
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}
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