duang 0.1.2

Use macro to provide default parameter and named parameter in Rust
Documentation 
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error: expected expression, found reserved identifier `_`
 --> $DIR/error-wildchar.rs:4:16
  |
4 | pub fn foo((_a,_):(i32,i32)) {}
  |                ^ expected expression
...
8 |   foo!((1,2));
  |   ------------ in this macro invocation