Rust · Macro

dbg!

Rust’s dbg! macro prints an expression’s location, source text, and Debug value to stderr, then returns the value. It is for quick debugging and also works in release builds.

Last updated 2 November 2026

Since

1.32.0

macro_rules! dbg { () => { ... }; ($val:expr $(,)?) => { ... }; ($($val:expr),+ $(,)?) => { ... }; }

Source: dbg in std - Rust. Checked 2026-11-03.