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test
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ui
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hygiene
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hygienic-label-2.rs
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macro_rules
!
foo
{
(
$e
:
expr
)
=>
{
'
x
:
loop
{
$e
}
}
}
pub
fn
main
()
{
foo
!(
break
'x); //~ ERROR use of undeclared label `'
x
`
}