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error[E0428]: the name `foo` is defined multiple times
--> $DIR/issue-38715.rs:5:1
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LL | macro_rules! foo { ($i:ident) => {} }
| ---------------- previous definition of the macro `foo` here
...
LL | macro_rules! foo { () => {} }
| ^^^^^^^^^^^^^^^^ `foo` redefined here
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= note: `foo` must be defined only once in the macro namespace of this module
error: aborting due to previous error
For more information about this error, try `rustc --explain E0428`.
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