core::file - Rust
Description: API documentation for the Rust `file` macro in crate `core`.
Keywords: rust, rustlang, rust-lang, file

# 1.0.0[−][src]Macro core::file

    macro_rules! file {
        () => { ... };
    }

Expands to the file name in which it was invoked.

With `line!` and `column!`, these macros provide debugging information for developers about the location within the source.

The expanded expression has type `&'static str`, and the returned file is not the invocation of the `file!` macro itself, but rather the first macro invocation leading up to the invocation of the `file!` macro.

# Examples

    let this_file = file!();
    println!("defined in file: {}", this_file);

Run