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dbg!() without parameters #57847

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Mar 19, 2019
Merged

dbg!() without parameters #57847

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dbg!() without parameters.
clarfonthey Jan 22, 2019
ea9e2c4
Test behaviour
clarfonthey Jan 31, 2019
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6 changes: 6 additions & 0 deletions src/libstd/macros.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -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!());
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};
($val:expr) => {
// Use of `match` here is intentional because it affects the lifetimes
// of temporaries - https://stackoverflow.com/a/48732525/1063961
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