Constify Eq, Ord, PartialOrd

library/coretests/tests/cmp.rs

@@ -215,19 +215,18 @@ fn cmp_default() {
     assert_eq!(Fool(false), Fool(true));
 }
 
-/* FIXME(#110395)
 mod const_cmp {
     use super::*;
 
     struct S(i32);
 
-    impl PartialEq for S {
+    impl const PartialEq for S {
         fn eq(&self, other: &Self) -> bool {
             self.0 == other.0
         }
     }
 
-    impl PartialOrd for S {
+    impl const PartialOrd for S {
         fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
             let ret = match (self.0, other.0) {
                 (a, b) if a > b => Ordering::Greater,
@@ -247,4 +246,3 @@ mod const_cmp {
     const _: () = assert!(S(0) < S(1));
     const _: () = assert!(S(1) > S(0));
 }
-*/

library/coretests/tests/lib.rs

@@ -15,6 +15,7 @@
 #![feature(cfg_target_has_reliable_f16_f128)]
 #![feature(char_max_len)]
 #![feature(clone_to_uninit)]
+#![feature(const_cmp)]
 #![feature(const_convert)]
 #![feature(const_destruct)]
 #![feature(const_eval_select)]