Say that it "may panic"

Author: wooster0

library/core/src/ops/index.rs

@@ -64,7 +64,7 @@ pub trait Index<Idx: ?Sized> {
     ///
     /// # Panics
     ///
-    /// Panics if the index is out of bounds.
+    /// May panic if the index is out of bounds.
     #[stable(feature = "rust1", since = "1.0.0")]
     #[track_caller]
     fn index(&self, index: Idx) -> &Self::Output;
@@ -168,7 +168,7 @@ pub trait IndexMut<Idx: ?Sized>: Index<Idx> {
     ///
     /// # Panics
     ///
-    /// Panics if the index is out of bounds.
+    /// May panic if the index is out of bounds.
     #[stable(feature = "rust1", since = "1.0.0")]
     #[track_caller]
     fn index_mut(&mut self, index: Idx) -> &mut Self::Output;