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error[E0428]: the name `A` is defined multiple times
--> $DIR/define-two.rs:15:21
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LL | #[proc_macro_derive(A)]
| - previous definition of the macro `A` here
...
LL | #[proc_macro_derive(A)]
| ^ `A` redefined here
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= note: `A` 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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