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macros
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best-failure.rs
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macro_rules
!
number
{
(
neg
false
,
$self
:
ident
)
=>
{
$self
};
(
$signed
:
tt
=>
$ty
:
ty
;)
=>
{
number
!(
neg $signed
,
$self
);
//~^ ERROR no rules expected the token `$`
};
}
number
!
{
false
=>
u8
;
}
fn
main
()
{}