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Document units for std::column #92335

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Dec 28, 2021
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Document units for std::column #92335

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12 changes: 12 additions & 0 deletions library/core/src/macros/mod.rs
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Expand Up @@ -1062,6 +1062,18 @@ pub(crate) mod builtin {
/// let current_col = column!();
/// println!("defined on column: {}", current_col);
/// ```
///
/// `column!` counts Unicode code points, not bytes or graphemes. As a result, the first two
/// invocations return the same value, but the third does not.
///
/// ```
/// let a = ("foobar", column!()).1;
/// let b = ("人之初性本善", column!()).1;
/// let c = ("f̅o̅o̅b̅a̅r̅", column!()).1; // Uses combining overline (U+0305)
///
/// assert_eq!(a, b);
/// assert_ne!(b, c);
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_builtin_macro]
#[macro_export]
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