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// build-pass (FIXME(62277): could be check-pass?)
// ignore-tidy-linelength
// Issue #21633: reject duplicate loop labels in function bodies.
// This is testing the exact cases that are in the issue description.
#[allow(unused_labels)]
fn foo() {
'fl: for _ in 0..10 { break; }
'fl: loop { break; } //~ WARN label name `'fl` shadows a label name that is already in scope
'lf: loop { break; }
'lf: for _ in 0..10 { break; } //~ WARN label name `'lf` shadows a label name that is already in scope
'wl: while 2 > 1 { break; }
'wl: loop { break; } //~ WARN label name `'wl` shadows a label name that is already in scope
'lw: loop { break; }
'lw: while 2 > 1 { break; } //~ WARN label name `'lw` shadows a label name that is already in scope
'fw: for _ in 0..10 { break; }
'fw: while 2 > 1 { break; } //~ WARN label name `'fw` shadows a label name that is already in scope
'wf: while 2 > 1 { break; }
'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; }
'tl: loop { break; } //~ WARN label name `'tl` shadows a label name that is already in scope
'lt: loop { break; }
'lt: while let Some(_) = None::<i32> { break; }
//~^ WARN label name `'lt` shadows a label name that is already in scope
}
// Note however that it is okay for the same label to be reused in
// different methods of one impl, as illustrated here.
struct S;
impl S {
fn m1(&self) { 'okay: loop { break 'okay; } }
fn m2(&self) { 'okay: loop { break 'okay; } }
}
pub fn main() {
let s = S;
s.m1();
s.m2();
foo();
}
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