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span
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macro-span-replacement.rs
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// build-pass (FIXME(62277): could be check-pass?)
#![
warn
(
unused
)]
macro_rules
!
m
{
(
$a
:
tt $b
:
tt
)
=>
{
$b $a
;
//~ WARN struct is never constructed
}
}
fn
main
()
{
m
!(
S
struct
);
}