| // Copyright 2015 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. |
| |
| #![feature(rustc_attrs)] |
| |
| // ignore-tidy-linelength |
| |
| // Issue #21633: reject duplicate loop labels in function bodies. |
| // |
| // This is testing the generalization (to the whole function body) |
| // discussed here: |
| // https://internals.rust-lang.org/t/psa-rejecting-duplicate-loop-labels/1833 |
| |
| pub fn foo() { |
| { 'fl: for _ in 0..10 { break; } } //~ NOTE shadowed label `'fl` declared here |
| { 'fl: loop { break; } } //~ WARN label name `'fl` shadows a label name that is already in scope |
| |
| { 'lf: loop { break; } } //~ NOTE shadowed label `'lf` declared here |
| { 'lf: for _ in 0..10 { break; } } //~ WARN label name `'lf` shadows a label name that is already in scope |
| |
| { 'wl: while 2 > 1 { break; } } //~ NOTE shadowed label `'wl` declared here |
| { 'wl: loop { break; } } //~ WARN label name `'wl` shadows a label name that is already in scope |
| |
| { 'lw: loop { break; } } //~ NOTE shadowed label `'lw` declared here |
| { 'lw: while 2 > 1 { break; } } //~ WARN label name `'lw` shadows a label name that is already in scope |
| |
| { 'fw: for _ in 0..10 { break; } } //~ NOTE shadowed label `'fw` declared here |
| { 'fw: while 2 > 1 { break; } } //~ WARN label name `'fw` shadows a label name that is already in scope |
| |
| { 'wf: while 2 > 1 { break; } } //~ NOTE shadowed label `'wf` declared here |
| { 'wf: for _ in 0..10 { break; } } //~ WARN label name `'wf` shadows a label name that is already in scope |
| |
| { 'tl: while let Some(_) = None::<i32> { break; } } //~ NOTE shadowed label `'tl` declared here |
| { 'tl: loop { break; } } //~ WARN label name `'tl` shadows a label name that is already in scope |
| |
| { 'lt: loop { break; } } //~ NOTE shadowed label `'lt` declared here |
| { 'lt: while let Some(_) = None::<i32> { break; } } |
| //~^ WARN label name `'lt` shadows a label name that is already in scope |
| } |
| |
| #[rustc_error] |
| pub fn main() { //~ ERROR compilation successful |
| foo(); |
| } |