Prepare test for old solver

tests/ui/consts/trait_alias.fail.stderr

@@ -1,9 +1,23 @@
 error[E0277]: the trait bound `T: [const] Baz` is not satisfied
-  --> $DIR/trait_alias.rs:22:11
+  --> $DIR/trait_alias.rs:23:11
    |
 LL |         x.baz();
    |           ^^^
 
-error: aborting due to 1 previous error
+error[E0277]: the trait bound `(): const Foo` is not satisfied
+  --> $DIR/trait_alias.rs:28:19
+   |
+LL | const _: () = foo(&());
+   |               --- ^^^
+   |               |
+   |               required by a bound introduced by this call
+   |
+note: required by a bound in `foo`
+  --> $DIR/trait_alias.rs:19:17
+   |
+LL | const fn foo<T: [const] Foo>(x: &T) {
+   |                 ^^^^^^^^^^^ required by this bound in `foo`
+
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0277`.

tests/ui/consts/trait_alias.next_fail.stderr

@@ -0,0 +1,9 @@
+error[E0277]: the trait bound `T: [const] Baz` is not satisfied
+  --> $DIR/trait_alias.rs:23:11
+   |
+LL |         x.baz();
+   |           ^^^
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.

tests/ui/consts/trait_alias.pass.stderr

@@ -0,0 +1,17 @@
+error[E0277]: the trait bound `(): const Foo` is not satisfied
+  --> $DIR/trait_alias.rs:28:19
+   |
+LL | const _: () = foo(&());
+   |               --- ^^^
+   |               |
+   |               required by a bound introduced by this call
+   |
+note: required by a bound in `foo`
+  --> $DIR/trait_alias.rs:19:17
+   |
+LL | const fn foo<T: [const] Foo>(x: &T) {
+   |                 ^^^^^^^^^^^ required by this bound in `foo`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.

tests/ui/consts/trait_alias.rs

@@ -1,7 +1,8 @@
 #![feature(trait_alias, const_trait_impl)]
-//@ revisions: pass fail
-//@ compile-flags: -Znext-solver
-//@[pass] check-pass
+//@ revisions: next_pass next_fail pass fail
+//@[next_pass] compile-flags: -Znext-solver
+//@[next_fail] compile-flags: -Znext-solver
+//@[next_pass] check-pass
 
 const trait Bar {
     fn bar(&self) {}
@@ -17,13 +18,14 @@ const trait Foo = [const] Bar + Baz;
 
 const fn foo<T: [const] Foo>(x: &T) {
     x.bar();
-    #[cfg(fail)]
+    #[cfg(any(fail, next_fail))]
     {
         x.baz();
-        //[fail]~^ ERROR: the trait bound `T: [const] Baz` is not satisfied
+        //[fail,next_fail]~^ ERROR: the trait bound `T: [const] Baz` is not satisfied
     }
 }
 
 const _: () = foo(&());
+//[fail,pass]~^ ERROR: `(): const Foo` is not satisfied
 
 fn main() {}