<commit_before>Multiple candidate files were found for an out-of-line module.

Erroneous code example:

```rust
// file: ambiguous_module/mod.rs

fn foo() {}
```

```rust
// file: ambiguous_module.rs

fn foo() {}
```

```ignore (multiple source files required for compile_fail)
mod ambiguous_module; // error: file for module `ambiguous_module`
                      // found at both ambiguous_module.rs and
                      // ambiguous_module.rs/mod.rs

fn main() {}
```

Please remove this ambiguity by deleting/renaming one of the candidate files.<commit_msg>Rollup merge of #75941 - GuillaumeGomez:cleanup-e0761, r=Dylan-DPC<commit_after>Multiple candidate files were found for an out-of-line module.

Erroneous code example:

```ignore (multiple source files required for compile_fail)
// file: ambiguous_module/mod.rs

fn foo() {}

// file: ambiguous_module.rs

fn foo() {}

// file: lib.rs

mod ambiguous_module; // error: file for module `ambiguous_module`
                      // found at both ambiguous_module.rs and
                      // ambiguous_module.rs/mod.rs
```

Please remove this ambiguity by deleting/renaming one of the candidate files.
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