61 lines
2.5 KiB
Rust
61 lines
2.5 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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// ignore-tidy-linelength
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// Issue #21633: reject duplicate loop labels in function bodies.
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// This is testing the exact cases that are in the issue description.
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fn foo() {
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'fl: for _ in 0..10 { break; } //~ NOTE shadowed label `'fl` declared here
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'fl: loop { break; } //~ WARN label name `'fl` shadows a label name that is already in scope
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'lf: loop { break; } //~ NOTE shadowed label `'lf` declared here
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'lf: for _ in 0..10 { break; } //~ WARN label name `'lf` shadows a label name that is already in scope
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'wl: while 2 > 1 { break; } //~ NOTE shadowed label `'wl` declared here
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'wl: loop { break; } //~ WARN label name `'wl` shadows a label name that is already in scope
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'lw: loop { break; } //~ NOTE shadowed label `'lw` declared here
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'lw: while 2 > 1 { break; } //~ WARN label name `'lw` shadows a label name that is already in scope
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'fw: for _ in 0..10 { break; } //~ NOTE shadowed label `'fw` declared here
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'fw: while 2 > 1 { break; } //~ WARN label name `'fw` shadows a label name that is already in scope
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'wf: while 2 > 1 { break; } //~ NOTE shadowed label `'wf` declared here
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'wf: for _ in 0..10 { break; } //~ WARN label name `'wf` shadows a label name that is already in scope
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'tl: while let Some(_) = None::<i32> { break; } //~ NOTE shadowed label `'tl` declared here
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'tl: loop { break; } //~ WARN label name `'tl` shadows a label name that is already in scope
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'lt: loop { break; } //~ NOTE shadowed label `'lt` declared here
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'lt: while let Some(_) = None::<i32> { break; }
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//~^ WARN label name `'lt` shadows a label name that is already in scope
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}
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// Note however that it is okay for the same label to be reused in
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// different methods of one impl, as illustrated here.
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struct S;
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impl S {
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fn m1(&self) { 'okay: loop { break 'okay; } }
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fn m2(&self) { 'okay: loop { break 'okay; } }
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}
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#[rustc_error]
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pub fn main() { //~ ERROR compilation successful
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let s = S;
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s.m1();
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s.m2();
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foo();
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}
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