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-rw-r--r--library/core/src/ops/index.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/library/core/src/ops/index.rs b/library/core/src/ops/index.rs
index 5e3dc48b6..228efb0bc 100644
--- a/library/core/src/ops/index.rs
+++ b/library/core/src/ops/index.rs
@@ -165,7 +165,7 @@ see chapter in The Book <https://doc.rust-lang.org/book/ch08-02-strings.html#ind
#[doc(alias = "]")]
#[doc(alias = "[]")]
#[const_trait]
-pub trait IndexMut<Idx: ?Sized>: Index<Idx> {
+pub trait IndexMut<Idx: ?Sized>: ~const Index<Idx> {
/// Performs the mutable indexing (`container[index]`) operation.
///
/// # Panics