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while-let-2.rs
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while-let-2.rs
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//@ run-pass
#[allow(dead_code)]
fn macros() {
macro_rules! foo{
($p:pat, $e:expr, $b:block) => {{
while let $p = $e $b
//~^ WARN irrefutable `while let`
//~| WARN irrefutable `while let`
}}
}
macro_rules! bar{
($p:pat, $e:expr, $b:block) => {{
foo!($p, $e, $b)
}}
}
foo!(_a, 1, {
println!("irrefutable pattern");
});
bar!(_a, 1, {
println!("irrefutable pattern");
});
}
pub fn main() {
while let _a = 1 { //~ WARN irrefutable `while let`
println!("irrefutable pattern");
break;
}
}
// ferrocene-annotations: fls_xa7lp0zg1ol2
// Declarative Macros
//
// ferrocene-annotations: fls_wjldgtio5o75
// Macro Expansion
//
// ferrocene-annotations: fls_vnvt40pa48n8
// Macro Invocation
//
// ferrocene-annotations: fls_4apk1exafxii
// Macro Matching
//
// ferrocene-annotations: fls_ym00b6ewf4n3
// Macro Transcription
//
// ferrocene-annotations: fls_8nzypdu9j3ge
// Metavariables
//
// ferrocene-annotations: fls_n3ktmjqf87qb
// Rule Matching
//
// ferrocene-annotations: fls_qpx6lgapce57
// Token Matching
//
// ferrocene-annotations: fls_m6kd5i9dy8dx
// While Let Loops
//
// ferrocene-annotations: fls_9kjpxri0axvg
// Weak Keywords