Fix test

Author: estebank

tests/ui/traits/const-traits/const_derives/derive-const-non-const-type.rs

@@ -3,8 +3,10 @@
 
 pub struct A;
 
-impl Default for A {
-    fn default() -> A { A }
+impl std::fmt::Debug for A {
+    fn fmt(&self, _: &mut std::fmt::Formatter<'_>)  -> Result<(), std::fmt::Error> {
+        panic!()
+    }
 }
 
 #[derive_const(Debug)]

tests/ui/traits/const-traits/const_derives/derive-const-non-const-type.stderr

@@ -1,27 +1,20 @@
 error: const `impl` for trait `Debug` which is not marked with `#[const_trait]`
-  --> $DIR/derive-const-non-const-type.rs:10:16
+  --> $DIR/derive-const-non-const-type.rs:12:16
    |
 LL | #[derive_const(Debug)]
    |                ^^^^^ this trait is not `const`
    |
    = note: marking a trait with `#[const_trait]` ensures all default method bodies are `const`
    = note: adding a non-const method body in the future would be a breaking change
 
-error[E0277]: `A` doesn't implement `Debug`
-  --> $DIR/derive-const-non-const-type.rs:11:14
+error[E0015]: cannot call non-const method `Formatter::<'_>::debug_tuple_field1_finish` in constant functions
+  --> $DIR/derive-const-non-const-type.rs:12:16
    |
 LL | #[derive_const(Debug)]
-   |                ----- in this derive macro expansion
-LL | pub struct S(A);
-   |              ^ the trait `Debug` is not implemented for `A`
-   |
-   = note: add `#[derive(Debug)]` to `A` or manually `impl Debug for A`
-help: consider annotating `A` with `#[derive(Debug)]`
-   |
-LL + #[derive(Debug)]
-LL | pub struct A;
+   |                ^^^^^
    |
+   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
 
 error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0277`.
+For more information about this error, try `rustc --explain E0015`.