Document usage of unsafe block

Krishna Sai Veera Reddy · Krishna Sai Veera Reddy · commit a30ee8e7636d · 2019-12-02T08:45:35.000-07:00
diff --git a/src/libcore/cmp.rs b/src/libcore/cmp.rs
@@ -1134,6 +1134,7 @@ mod impls {
                 -1 => Less,
                 0 => Equal,
                 1 => Greater,
+                // SAFETY: Unreachable code
                 _ => unsafe { unreachable_unchecked() },
             }
         }

Original file line number	Diff line number	Diff line change
`@@ -1134,6 +1134,7 @@ mod impls {`
`1134`	`1134`	`-1 => Less,`
`1135`	`1135`	`0 => Equal,`
`1136`	`1136`	`1 => Greater,`
	`1137`	`+ // SAFETY: Unreachable code`
`1137`	`1138`	`_ => unsafe { unreachable_unchecked() },`
`1138`	`1139`	`}`
`1139`	`1140`	`}`