diff --git a/library/core/src/any.rs b/library/core/src/any.rs
index 3ab95438c3ff3..3935dfe309c10 100644
--- a/library/core/src/any.rs
+++ b/library/core/src/any.rs
@@ -227,7 +227,7 @@ impl dyn Any {
             // SAFETY: just checked whether we are pointing to the correct type, and we can rely on
             // that check for memory safety because we have implemented Any for all types; no other
             // impls can exist as they would conflict with our impl.
-            unsafe { Some(self.downcast_ref_unchecked()) }
+            unsafe { Some(self.downcast_unchecked_ref()) }
         } else {
             None
         }
@@ -263,7 +263,7 @@ impl dyn Any {
             // SAFETY: just checked whether we are pointing to the correct type, and we can rely on
             // that check for memory safety because we have implemented Any for all types; no other
             // impls can exist as they would conflict with our impl.
-            unsafe { Some(self.downcast_mut_unchecked()) }
+            unsafe { Some(self.downcast_unchecked_mut()) }
         } else {
             None
         }
@@ -281,7 +281,7 @@ impl dyn Any {
     /// let x: Box<dyn Any> = Box::new(1_usize);
     ///
     /// unsafe {
-    ///     assert_eq!(*x.downcast_ref_unchecked::<usize>(), 1);
+    ///     assert_eq!(*x.downcast_unchecked_ref::<usize>(), 1);
     /// }
     /// ```
     ///
@@ -291,7 +291,7 @@ impl dyn Any {
     /// with the incorrect type is *undefined behavior*.
     #[unstable(feature = "downcast_unchecked", issue = "90850")]
     #[inline]
-    pub unsafe fn downcast_ref_unchecked<T: Any>(&self) -> &T {
+    pub unsafe fn downcast_unchecked_ref<T: Any>(&self) -> &T {
         debug_assert!(self.is::<T>());
         // SAFETY: caller guarantees that T is the correct type
         unsafe { &*(self as *const dyn Any as *const T) }
@@ -309,7 +309,7 @@ impl dyn Any {
     /// let mut x: Box<dyn Any> = Box::new(1_usize);
     ///
     /// unsafe {
-    ///     *x.downcast_mut_unchecked::<usize>() += 1;
+    ///     *x.downcast_unchecked_mut::<usize>() += 1;
     /// }
     ///
     /// assert_eq!(*x.downcast_ref::<usize>().unwrap(), 2);
@@ -321,7 +321,7 @@ impl dyn Any {
     /// with the incorrect type is *undefined behavior*.
     #[unstable(feature = "downcast_unchecked", issue = "90850")]
     #[inline]
-    pub unsafe fn downcast_mut_unchecked<T: Any>(&mut self) -> &mut T {
+    pub unsafe fn downcast_unchecked_mut<T: Any>(&mut self) -> &mut T {
         debug_assert!(self.is::<T>());
         // SAFETY: caller guarantees that T is the correct type
         unsafe { &mut *(self as *mut dyn Any as *mut T) }
@@ -417,7 +417,7 @@ impl dyn Any + Send {
     /// let x: Box<dyn Any> = Box::new(1_usize);
     ///
     /// unsafe {
-    ///     assert_eq!(*x.downcast_ref_unchecked::<usize>(), 1);
+    ///     assert_eq!(*x.downcast_unchecked_ref::<usize>(), 1);
     /// }
     /// ```
     ///
@@ -427,9 +427,9 @@ impl dyn Any + Send {
     /// with the incorrect type is *undefined behavior*.
     #[unstable(feature = "downcast_unchecked", issue = "90850")]
     #[inline]
-    pub unsafe fn downcast_ref_unchecked<T: Any>(&self) -> &T {
+    pub unsafe fn downcast_unchecked_ref<T: Any>(&self) -> &T {
         // SAFETY: guaranteed by caller
-        unsafe { <dyn Any>::downcast_ref_unchecked::<T>(self) }
+        unsafe { <dyn Any>::downcast_unchecked_ref::<T>(self) }
     }
 
     /// Forwards to the method defined on the type `dyn Any`.
@@ -444,7 +444,7 @@ impl dyn Any + Send {
     /// let mut x: Box<dyn Any> = Box::new(1_usize);
     ///
     /// unsafe {
-    ///     *x.downcast_mut_unchecked::<usize>() += 1;
+    ///     *x.downcast_unchecked_mut::<usize>() += 1;
     /// }
     ///
     /// assert_eq!(*x.downcast_ref::<usize>().unwrap(), 2);
@@ -456,9 +456,9 @@ impl dyn Any + Send {
     /// with the incorrect type is *undefined behavior*.
     #[unstable(feature = "downcast_unchecked", issue = "90850")]
     #[inline]
-    pub unsafe fn downcast_mut_unchecked<T: Any>(&mut self) -> &mut T {
+    pub unsafe fn downcast_unchecked_mut<T: Any>(&mut self) -> &mut T {
         // SAFETY: guaranteed by caller
-        unsafe { <dyn Any>::downcast_mut_unchecked::<T>(self) }
+        unsafe { <dyn Any>::downcast_unchecked_mut::<T>(self) }
     }
 }
 
@@ -551,7 +551,7 @@ impl dyn Any + Send + Sync {
     /// let x: Box<dyn Any> = Box::new(1_usize);
     ///
     /// unsafe {
-    ///     assert_eq!(*x.downcast_ref_unchecked::<usize>(), 1);
+    ///     assert_eq!(*x.downcast_unchecked_ref::<usize>(), 1);
     /// }
     /// ```
     /// # Safety
@@ -560,9 +560,9 @@ impl dyn Any + Send + Sync {
     /// with the incorrect type is *undefined behavior*.
     #[unstable(feature = "downcast_unchecked", issue = "90850")]
     #[inline]
-    pub unsafe fn downcast_ref_unchecked<T: Any>(&self) -> &T {
+    pub unsafe fn downcast_unchecked_ref<T: Any>(&self) -> &T {
         // SAFETY: guaranteed by caller
-        unsafe { <dyn Any>::downcast_ref_unchecked::<T>(self) }
+        unsafe { <dyn Any>::downcast_unchecked_ref::<T>(self) }
     }
 
     /// Forwards to the method defined on the type `Any`.
@@ -577,7 +577,7 @@ impl dyn Any + Send + Sync {
     /// let mut x: Box<dyn Any> = Box::new(1_usize);
     ///
     /// unsafe {
-    ///     *x.downcast_mut_unchecked::<usize>() += 1;
+    ///     *x.downcast_unchecked_mut::<usize>() += 1;
     /// }
     ///
     /// assert_eq!(*x.downcast_ref::<usize>().unwrap(), 2);
@@ -588,9 +588,9 @@ impl dyn Any + Send + Sync {
     /// with the incorrect type is *undefined behavior*.
     #[unstable(feature = "downcast_unchecked", issue = "90850")]
     #[inline]
-    pub unsafe fn downcast_mut_unchecked<T: Any>(&mut self) -> &mut T {
+    pub unsafe fn downcast_unchecked_mut<T: Any>(&mut self) -> &mut T {
         // SAFETY: guaranteed by caller
-        unsafe { <dyn Any>::downcast_mut_unchecked::<T>(self) }
+        unsafe { <dyn Any>::downcast_unchecked_mut::<T>(self) }
     }
 }
 
diff --git a/tests/ui/suggestions/ambiguous-assoc-type-path-suggest-similar-item.rs b/tests/ui/suggestions/ambiguous-assoc-type-path-suggest-similar-item.rs
index a9c2c20ef374a..45f9f6bc5191d 100644
--- a/tests/ui/suggestions/ambiguous-assoc-type-path-suggest-similar-item.rs
+++ b/tests/ui/suggestions/ambiguous-assoc-type-path-suggest-similar-item.rs
@@ -44,7 +44,7 @@ fn main() {
     //~^ ERROR ambiguous associated type [E0223]
     //~| HELP if there were a trait named `Example` with associated type `wrapping`
 
-    // this one ideally should suggest `downcast_mut_unchecked`
+    // this one ideally should suggest `downcast_unchecked_mut`
     <dyn std::any::Any>::downcast::mut_unchecked;
     //~^ ERROR ambiguous associated type [E0223]
     //~| HELP if there were a trait named `Example` with associated type `downcast`