Use E0665 for missing `#[default]` error

Use orphaned error code for the same error it belonged to before.

```
error[E0665]: `#[derive(Default)]` on enum with no `#[default]`
  --> $DIR/macros-nonfatal-errors.rs:42:10
   |
LL |   #[derive(Default)]
   |            ^^^^^^^
LL | / enum NoDeclaredDefault {
LL | |     Foo,
LL | |     Bar,
LL | | }
   | |_- this enum needs a unit variant marked with `#[default]`
   |
   = note: this error originates in the derive macro `Default` (in Nightly builds, run with -Z macro-backtrace for more info)
help: make this unit variant default by placing `#[default]` on it
   |
LL |     #[default] Foo,
   |     ~~~~~~~~~~~~~~
help: make this unit variant default by placing `#[default]` on it
   |
LL |     #[default] Bar,
   |     ~~~~~~~~~~~~~~
```

1 files changed, 7 insertions, 1 deletions

diff --git a/tests/ui/macros/macros-nonfatal-errors.rs b/tests/ui/macros/macros-nonfatal-errors.rs
index 46e865031ec..658455b1b5b 100644
--- a/tests/ui/macros/macros-nonfatal-errors.rs
+++ b/tests/ui/macros/macros-nonfatal-errors.rs
@@ -39,12 +39,18 @@ enum AttrOnInnerExpression {
     Baz,
 }
 
-#[derive(Default)] //~ ERROR no default declared
+#[derive(Default)] //~ ERROR `#[derive(Default)]` on enum with no `#[default]`
 enum NoDeclaredDefault {
     Foo,
     Bar,
 }
 
+#[derive(Default)] //~ ERROR `#[derive(Default)]` on enum with no `#[default]`
+enum NoDeclaredDefaultWithoutUnitVariant {
+    Foo(i32),
+    Bar(i32),
+}
+
 #[derive(Default)] //~ ERROR multiple declared defaults
 enum MultipleDefaults {
     #[default]