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A builtin-macro was defined more than once.
Erroneous code example:
```compile_fail,E0773
#![feature(decl_macro)]
#![feature(rustc_attrs)]
#[rustc_builtin_macro]
pub macro test($item:item) {
/* compiler built-in */
}
mod inner {
#[rustc_builtin_macro]
pub macro test($item:item) {
/* compiler built-in */
}
}
```
To fix the issue, remove the duplicate declaration:
```
#![feature(decl_macro)]
#![feature(rustc_attrs)]
#[rustc_builtin_macro]
pub macro test($item:item) {
/* compiler built-in */
}
```
In very rare edge cases, this may happen when loading `core` or `std` twice,
once with `check` metadata and once with `build` metadata.
For more information, see [#75176].
[#75176]: https://github.com/rust-lang/rust/pull/75176#issuecomment-683234468
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