Document the unsafe

saethlin · saethlin · commit 56fcd59ec642 · 2025-10-11T23:08:01.000-04:00
diff --git a/library/core/src/displaywrapper.rs b/library/core/src/displaywrapper.rs
@@ -187,6 +187,7 @@ impl<T: Displayable> Display for DisplayWrapper<T> {
                 buf[cur] = b'-';
             }
         }
+        // SAFETY: The buffer is initially ASCII and we only write ASCII bytes to it.
         let s = unsafe { core::str::from_utf8_unchecked(&buf[cur..]) };
         f.write_str(s)
     }

Original file line number	Diff line number	Diff line change
`@@ -187,6 +187,7 @@ impl<T: Displayable> Display for DisplayWrapper<T> {`
`187`	`187`	`buf[cur] = b'-';`
`188`	`188`	`}`
`189`	`189`	`}`
	`190`	`+ // SAFETY: The buffer is initially ASCII and we only write ASCII bytes to it.`
`190`	`191`	`let s = unsafe { core::str::from_utf8_unchecked(&buf[cur..]) };`
`191`	`192`	`f.write_str(s)`
`192`	`193`	`}`