diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index d7e822382ef..93d542cd437 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -516,6 +516,8 @@ symbols! {
         cmp,
         cmp_max,
         cmp_min,
+        cmp_partialeq_eq,
+        cmp_partialeq_ne,
         cmpxchg16b_target_feature,
         cmse_nonsecure_entry,
         coerce_unsized,
diff --git a/library/core/src/cmp.rs b/library/core/src/cmp.rs
index fadf2fcc9fc..68543592dbc 100644
--- a/library/core/src/cmp.rs
+++ b/library/core/src/cmp.rs
@@ -229,6 +229,7 @@ pub trait PartialEq<Rhs: ?Sized = Self> {
     /// by `==`.
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[cfg_attr(not(bootstrap), rustc_diagnostic_item = "cmp_partialeq_eq")]
     fn eq(&self, other: &Rhs) -> bool;
 
     /// This method tests for `!=`. The default implementation is almost always
@@ -236,6 +237,7 @@ pub trait PartialEq<Rhs: ?Sized = Self> {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[cfg_attr(not(bootstrap), rustc_diagnostic_item = "cmp_partialeq_ne")]
     fn ne(&self, other: &Rhs) -> bool {
         !self.eq(other)
     }