Test anon consts in addition to path consts for repeat expr hack

Author: camelid

tests/ui/const-generics/repeat_expr_hack_gives_right_generics.rs

@@ -15,6 +15,8 @@ fn bar<const N: usize>() {}
 fn foo<const N: usize>() {
     bar::<{ [1; N] }>();
     //~^ ERROR: generic parameters may not be used in const operations
+    bar::<{ [1; { N + 1 }] }>();
+    //~^ ERROR: generic parameters may not be used in const operations
 }
 
 fn main() {}

tests/ui/const-generics/repeat_expr_hack_gives_right_generics.stderr

@@ -7,5 +7,14 @@ LL |     bar::<{ [1; N] }>();
    = help: const parameters may only be used as standalone arguments, i.e. `N`
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
-error: aborting due to 1 previous error
+error: generic parameters may not be used in const operations
+  --> $DIR/repeat_expr_hack_gives_right_generics.rs:18:19
+   |
+LL |     bar::<{ [1; { N + 1 }] }>();
+   |                   ^ cannot perform const operation using `N`
+   |
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
+   = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
+
+error: aborting due to 2 previous errors