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macro_rules! foo {
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{ $+ } => { //~ ERROR expected identifier, found `+`
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//~^ ERROR missing fragment specifier
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//~| ERROR missing fragment specifier
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//~| WARN this was previously accepted
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$(x)(y) //~ ERROR expected one of: `*`, `+`, or `?`
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}
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}
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foo!();
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fn main() {}
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