Update tests

Author: estebank

tests/ui/consts/rustc-impl-const-stability.rs

@@ -12,8 +12,8 @@ pub struct Data {
 
 #[stable(feature = "potato", since = "1.27.0")]
 #[rustc_const_unstable(feature = "data_foo", issue = "none")]
-impl const Default for Data {
-    fn default() -> Data {
-        Data { _data: 42 }
+impl const std::fmt::Debug for Data {
+    fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+        panic!()
     }
 }

tests/ui/consts/rustc-impl-const-stability.stderr

@@ -1,8 +1,8 @@
-error: const `impl` for trait `Default` which is not marked with `#[const_trait]`
+error: const `impl` for trait `Debug` which is not marked with `#[const_trait]`
   --> $DIR/rustc-impl-const-stability.rs:15:12
    |
-LL | impl const Default for Data {
-   |            ^^^^^^^ this trait is not `const`
+LL | impl const std::fmt::Debug for Data {
+   |            ^^^^^^^^^^^^^^^ 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

tests/ui/const-generics/std/const-generics-alloc.rs renamed to tests/ui/traits/const-traits/const-traits-alloc.rs

@@ -1,6 +1,6 @@
 #[derive_const(Debug)] //~ ERROR use of unstable library feature
 //~^ ERROR const `impl` for trait `Debug` which is not marked with `#[const_trait]`
-//~| ERROR cannot call non-const method `Formatter::<'_>::write_str` in constant functions
+//~| ERROR cannot call non-const method
 pub struct S;
 
 fn main() {}

tests/ui/const-generics/std/const-generics-core.rs renamed to tests/ui/traits/const-traits/const-traits-core.rs

@@ -7,7 +7,7 @@ impl Default for A {
     fn default() -> A { A }
 }
 
-#[derive_const(Default)]
+#[derive_const(Debug)]
 pub struct S(A);
 
 fn main() {}

tests/ui/traits/const-traits/const_derives/derive-const-gate.rs

@@ -1,23 +1,27 @@
-error[E0658]: use of unstable const library feature `const_default`
+error: const `impl` for trait `Debug` which is not marked with `#[const_trait]`
   --> $DIR/derive-const-non-const-type.rs:10:16
    |
-LL | #[derive_const(Default)]
-   |                ^^^^^^^ trait is not stable as const yet
+LL | #[derive_const(Debug)]
+   |                ^^^^^ this trait is not `const`
    |
-   = help: add `#![feature(const_default)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+   = 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[E0015]: cannot call non-const associated function `<A as Default>::default` in constant functions
+error[E0277]: `A` doesn't implement `Debug`
   --> $DIR/derive-const-non-const-type.rs:11:14
    |
-LL | #[derive_const(Default)]
-   |                ------- in this derive macro expansion
+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
 
-Some errors have detailed explanations: E0015, E0658.
-For more information about an error, try `rustc --explain E0015`.
+For more information about this error, try `rustc --explain E0277`.