Update tests

src/test/ui/rfc-2632-const-trait-impl/const-check-fns-in-const-impl.rs

@@ -10,7 +10,7 @@ fn non_const() {}
 
 impl const T for S {
     fn foo() { non_const() }
-    //~^ ERROR
+    //~^ ERROR can only call other `const fn`
 }
 
 fn main() {}

src/test/ui/rfc-2632-const-trait-impl/const-check-fns-in-const-impl.stderr

@@ -4,7 +4,7 @@ error[E0723]: can only call other `const fn` within a `const fn`, but `const non
 LL |     fn foo() { non_const() }
    |                ^^^^^^^^^^^
    |
-   = note: for more information, see issue /~https://github.com/rust-lang/rust/issues/57563
+   = note: see issue #57563 </~https://github.com/rust-lang/rust/issues/57563> for more information
    = help: add `#![feature(const_fn)]` to the crate attributes to enable
 
 error: aborting due to previous error

src/test/ui/rfc-2632-const-trait-impl/stability.rs

@@ -6,6 +6,17 @@
 
 pub struct Int(i32);
 
+#[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_const_stable(feature = "rust1", since = "1.0.0")]
+impl const std::ops::Sub for Int {
+    type Output = Self;
+
+    fn sub(self, rhs: Self) -> Self {
+        //~^ ERROR trait methods cannot be stable const fn
+        Int(self.0 - rhs.0)
+    }
+}
+
 #[rustc_const_unstable(feature = "const_add", issue = "none")]
 impl const std::ops::Add for Int {
     type Output = Self;
@@ -29,5 +40,4 @@ pub const fn bar() -> Int {
     Int(1i32) + Int(2i32)
 }
 
-
 fn main() {}

src/test/ui/rfc-2632-const-trait-impl/stability.stderr

@@ -1,12 +1,24 @@
+error[E0723]: trait methods cannot be stable const fn
+  --> $DIR/stability.rs:14:5
+   |
+LL | /     fn sub(self, rhs: Self) -> Self {
+LL | |
+LL | |         Int(self.0 - rhs.0)
+LL | |     }
+   | |_____^
+   |
+   = note: see issue #57563 </~https://github.com/rust-lang/rust/issues/57563> for more information
+   = help: add `#![feature(const_fn)]` to the crate attributes to enable
+
 error[E0723]: can only call other `const fn` within a `const fn`, but `const <Int as std::ops::Add>::add` is not stable as `const fn`
-  --> $DIR/stability.rs:21:5
+  --> $DIR/stability.rs:32:5
    |
 LL |     Int(1i32) + Int(2i32)
    |     ^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: for more information, see issue /~https://github.com/rust-lang/rust/issues/57563
+   = note: see issue #57563 </~https://github.com/rust-lang/rust/issues/57563> for more information
    = help: add `#![feature(const_fn)]` to the crate attributes to enable
 
-error: aborting due to previous error
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0723`.