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Specify the behavior of file! #134442

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Specify the behavior of file! #134442

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8 changes: 8 additions & 0 deletions library/core/src/macros/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1295,6 +1295,14 @@ pub(crate) mod builtin {
/// first macro invocation leading up to the invocation of the `file!`
/// macro.
///
/// The file name is derived from the root module's source path passed to the Rust compiler
/// and the sequence the compiler takes to get from root module to the
/// module containing `file!`, modified by any flags passed to the Rust compiler (e.g.
/// `--remap-path-prefix`). If the root module's source path is relative, the initial base
/// directory will be the working directory of the Rust compiler. For example, if the source
/// path passed to the compiler is `./src/lib.rs` which has a `mod foo;` with a source path of
/// `src/foo/mod.rs`, then calling `file!` inside `mod foo;` will return `./src/foo/mod.rs`.
///
/// # Examples
///
/// ```
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