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error: no rules expected the token `_`
--> $DIR/underscore-ident-matcher.rs:8:19
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LL | macro_rules! identity {
| --------------------- when calling this macro
...
LL | let identity!(_) = 10;
| ^ no rules expected this token in macro call
|
note: while trying to match meta-variable `$i:ident`
--> $DIR/underscore-ident-matcher.rs:2:6
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LL | ($i: ident) => (
| ^^^^^^^^^
error: aborting due to 1 previous error
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