Re-enable `ConstArgKind::Path` lowering by default

...and remove the `const_arg_path` feature gate as a result. It was only
a stopgap measure to fix the regression that the new lowering introduced
(which should now be fixed by this PR).

4 files changed, 4 insertions, 26 deletions

diff --git a/tests/ui/specialization/default-proj-ty-as-type-of-const-issue-125757.rs b/tests/ui/specialization/default-proj-ty-as-type-of-const-issue-125757.rs
index 858fba2132a..fb962ad24bf 100644
--- a/tests/ui/specialization/default-proj-ty-as-type-of-const-issue-125757.rs
+++ b/tests/ui/specialization/default-proj-ty-as-type-of-const-issue-125757.rs
@@ -14,6 +14,5 @@ struct Wrapper<const C: <i32 as Trait>::Type> {}
 
 impl<const C: usize> Wrapper<C> {}
 //~^ ERROR the constant `C` is not of type `<i32 as Trait>::Type`
-//~| ERROR: mismatched types
 
 fn main() {}
diff --git a/tests/ui/specialization/default-proj-ty-as-type-of-const-issue-125757.stderr b/tests/ui/specialization/default-proj-ty-as-type-of-const-issue-125757.stderr
index 71d4277275f..7094ee8c67c 100644
--- a/tests/ui/specialization/default-proj-ty-as-type-of-const-issue-125757.stderr
+++ b/tests/ui/specialization/default-proj-ty-as-type-of-const-issue-125757.stderr
@@ -20,17 +20,5 @@ note: required by a const generic parameter in `Wrapper`
 LL | struct Wrapper<const C: <i32 as Trait>::Type> {}
    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this const generic parameter in `Wrapper`
 
-error[E0308]: mismatched types
-  --> $DIR/default-proj-ty-as-type-of-const-issue-125757.rs:15:30
-   |
-LL | impl<const C: usize> Wrapper<C> {}
-   |                              ^ expected associated type, found `usize`
-   |
-   = note: expected associated type `<i32 as Trait>::Type`
-                         found type `usize`
-   = help: consider constraining the associated type `<i32 as Trait>::Type` to `usize`
-   = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
-
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/specialization/min_specialization/bad-const-wf-doesnt-specialize.rs b/tests/ui/specialization/min_specialization/bad-const-wf-doesnt-specialize.rs
index f89a463bc58..a0ee7714417 100644
--- a/tests/ui/specialization/min_specialization/bad-const-wf-doesnt-specialize.rs
+++ b/tests/ui/specialization/min_specialization/bad-const-wf-doesnt-specialize.rs
@@ -6,7 +6,6 @@
 struct S<const L: usize>;
 
 impl<const N: i32> Copy for S<N> {}
-//~^ ERROR: mismatched types
 impl<const M: usize> Copy for S<M> {}
 //~^ ERROR: conflicting implementations of trait `Copy` for type `S<_>`
 
diff --git a/tests/ui/specialization/min_specialization/bad-const-wf-doesnt-specialize.stderr b/tests/ui/specialization/min_specialization/bad-const-wf-doesnt-specialize.stderr
index 1dac58e1f69..2953bc95917 100644
--- a/tests/ui/specialization/min_specialization/bad-const-wf-doesnt-specialize.stderr
+++ b/tests/ui/specialization/min_specialization/bad-const-wf-doesnt-specialize.stderr
@@ -1,19 +1,11 @@
 error[E0119]: conflicting implementations of trait `Copy` for type `S<_>`
-  --> $DIR/bad-const-wf-doesnt-specialize.rs:10:1
+  --> $DIR/bad-const-wf-doesnt-specialize.rs:9:1
    |
 LL | impl<const N: i32> Copy for S<N> {}
    | -------------------------------- first implementation here
-LL |
 LL | impl<const M: usize> Copy for S<M> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `S<_>`
 
-error[E0308]: mismatched types
-  --> $DIR/bad-const-wf-doesnt-specialize.rs:8:31
-   |
-LL | impl<const N: i32> Copy for S<N> {}
-   |                               ^ expected `usize`, found `i32`
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
-Some errors have detailed explanations: E0119, E0308.
-For more information about an error, try `rustc --explain E0119`.
+For more information about this error, try `rustc --explain E0119`.