2 files changed, 34 insertions, 0 deletions
diff --git a/src/tools/rust-analyzer/crates/ide-db/src/famous_defs.rs b/src/tools/rust-analyzer/crates/ide-db/src/famous_defs.rs
index 994150b1ac4..8e687385086 100644
--- a/src/tools/rust-analyzer/crates/ide-db/src/famous_defs.rs
+++ b/src/tools/rust-analyzer/crates/ide-db/src/famous_defs.rs
@@ -106,6 +106,18 @@ impl FamousDefs<'_, '_> {
         self.find_trait("core:convert:AsRef")
     }
 
+    pub fn core_convert_AsMut(&self) -> Option<Trait> {
+        self.find_trait("core:convert:AsMut")
+    }
+
+    pub fn core_borrow_Borrow(&self) -> Option<Trait> {
+        self.find_trait("core:borrow:Borrow")
+    }
+
+    pub fn core_borrow_BorrowMut(&self) -> Option<Trait> {
+        self.find_trait("core:borrow:BorrowMut")
+    }
+
     pub fn core_ops_ControlFlow(&self) -> Option<Enum> {
         self.find_enum("core:ops:ControlFlow")
     }
diff --git a/src/tools/rust-analyzer/crates/test-utils/src/minicore.rs b/src/tools/rust-analyzer/crates/test-utils/src/minicore.rs
index c79aaba054b..dc1eba1a1ab 100644
--- a/src/tools/rust-analyzer/crates/test-utils/src/minicore.rs
+++ b/src/tools/rust-analyzer/crates/test-utils/src/minicore.rs
@@ -11,10 +11,13 @@
 //!     add:
 //!     asm:
 //!     assert:
+//!     as_mut: sized
 //!     as_ref: sized
 //!     async_fn: fn, tuple, future, copy
 //!     bool_impl: option, fn
 //!     builtin_impls:
+//!     borrow: sized
+//!     borrow_mut: borrow
 //!     cell: copy, drop
 //!     clone: sized
 //!     coerce_pointee: derive, sized, unsize, coerce_unsized, dispatch_from_dyn
@@ -380,11 +383,30 @@ pub mod convert {
         fn as_ref(&self) -> &T;
     }
     // endregion:as_ref
+    // region:as_mut
+    pub trait AsMut<T: crate::marker::PointeeSized>: crate::marker::PointeeSized {
+        fn as_mut(&mut self) -> &mut T;
+    }
+    // endregion:as_mut
     // region:infallible
     pub enum Infallible {}
     // endregion:infallible
 }
 
+pub mod borrow {
+    // region:borrow
+    pub trait Borrow<Borrowed: ?Sized> {
+        fn borrow(&self) -> &Borrowed;
+    }
+    // endregion:borrow
+
+    // region:borrow_mut
+    pub trait BorrowMut<Borrowed: ?Sized>: Borrow<Borrowed> {
+        fn borrow_mut(&mut self) -> &mut Borrowed;
+    }
+    // endregion:borrow_mut
+}
+
 pub mod mem {
     // region:manually_drop
     use crate::marker::PointeeSized;