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-rw-r--r--src/libcore/time.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libcore/time.rs b/src/libcore/time.rs
index 5a0e4388e03..57fc1a7b760 100644
--- a/src/libcore/time.rs
+++ b/src/libcore/time.rs
@@ -920,7 +920,7 @@ impl fmt::Debug for Duration {
             if end == 0 {
                 write!(f, "{}", integer_part)
             } else {
-                // We are only writing ASCII digits into the buffer and it was
+                // SAFETY: We are only writing ASCII digits into the buffer and it was
                 // initialized with '0's, so it contains valid UTF8.
                 let s = unsafe {
                     crate::str::from_utf8_unchecked(&buf[..end])