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dbg!() without parameters.

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Clar Fon 2019-01-22 17:51:33 -05:00
parent 96909179d9
commit 6fb5b73cf4
1 changed files with 6 additions and 0 deletions
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6
src/libstd/macros.rs
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@ -305,10 +305,16 @@ macro_rules! eprintln {
/// let _ = dbg!(a); // <-- `a` is moved again; error!
/// ```
///
/// You can also use `dbg!()` without a value to just print the
/// file and line whenever it's reached.
///
/// [stderr]: https://en.wikipedia.org/wiki/Standard_streams#Standard_error_(stderr)
#[macro_export]
#[stable(feature = "dbg_macro", since = "1.32.0")]
macro_rules! dbg {
() => {
eprintln!("[{}:{}]", file!(), line!());
};
($val:expr) => {
// Use of `match` here is intentional because it affects the lifetimes
// of temporaries - https://stackoverflow.com/a/48732525/1063961