Rollup merge of rust-lang#91439 - ecstatic-morse:const-cmp-trait-default-methods, r=oli-obk

Mark defaulted `PartialEq`/`PartialOrd` methods as const

WIthout it, `const` impls of these traits are unpleasant to write. I think this kind of change is allowed now. although it looks like it might require some Miri tweaks. Let's find out.

r? `@fee1-dead`

Author: matthiaskrgr

library/core/src/cmp.rs

@@ -215,6 +215,7 @@ pub trait PartialEq<Rhs: ?Sized = Self> {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[default_method_body_is_const]
     fn ne(&self, other: &Rhs) -> bool {
         !self.eq(other)
     }
@@ -1031,6 +1032,7 @@ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[default_method_body_is_const]
     fn lt(&self, other: &Rhs) -> bool {
         matches!(self.partial_cmp(other), Some(Less))
     }
@@ -1050,6 +1052,7 @@ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[default_method_body_is_const]
     fn le(&self, other: &Rhs) -> bool {
         // Pattern `Some(Less | Eq)` optimizes worse than negating `None | Some(Greater)`.
         // FIXME: The root cause was fixed upstream in LLVM with:
@@ -1072,6 +1075,7 @@ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[default_method_body_is_const]
     fn gt(&self, other: &Rhs) -> bool {
         matches!(self.partial_cmp(other), Some(Greater))
     }
@@ -1091,6 +1095,7 @@ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[default_method_body_is_const]
     fn ge(&self, other: &Rhs) -> bool {
         matches!(self.partial_cmp(other), Some(Greater | Equal))
     }

library/core/tests/cmp.rs

@@ -203,3 +203,31 @@ fn cmp_default() {
     assert!(Fool(false) != Fool(false));
     assert_eq!(Fool(false), Fool(true));
 }
+
+struct S(i32);
+
+impl const PartialEq for S {
+    fn eq(&self, other: &Self) -> bool {
+        self.0 == other.0
+    }
+}
+
+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,
+            (a, b) if a < b => Ordering::Less,
+            _ => Ordering::Equal,
+        };
+
+        Some(ret)
+    }
+}
+
+const _: () = assert!(S(1) == S(1));
+const _: () = assert!(S(0) != S(1));
+
+const _: () = assert!(S(1) <= S(1));
+const _: () = assert!(S(1) >= S(1));
+const _: () = assert!(S(0) <  S(1));
+const _: () = assert!(S(1) >  S(0));