std::line! [] [src]

macro_rules! line { () => ({ /* compiler built-in */ }) }

A macro which expands to the line number on which it was invoked.

The expanded expression has type u32`u32, and the returned line is not the invocation of theline!()macro itself, but rather the first macro invocation leading up to the invocation of theline!()` macro.

Examples

fn main() { let current_line = line!(); println!("defined on line: {}", current_line); }
let current_line = line!();
println!("defined on line: {}", current_line);