diff options
| -rw-r--r-- | library/core/src/macros/mod.rs | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/library/core/src/macros/mod.rs b/library/core/src/macros/mod.rs index af6718df653..d9389892c0c 100644 --- a/library/core/src/macros/mod.rs +++ b/library/core/src/macros/mod.rs @@ -1065,6 +1065,18 @@ 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] |