Rollup merge of #83935 - SNCPlay42:param-default-impl-trait, r=varkor

forbid `impl Trait` in generic param defaults

Fixes #83929

Forbid using `impl Trait` in the default types of generic parameters, e.g. `struct Foo<T = impl Trait>`. I assume this was never supposed to be allowed - it seems no UI test used it.

Note that using `impl Trait` in this position did not hit a feature gate error; however, this *shouldn't* be a breaking change as any attempt to use it should have hit the ICE in #83929 and/or failed to provide a defining use of the `impl Trait`.

compiler/rustc_ast_lowering/src/lib.rs

@@ -2259,13 +2259,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
 
                 let kind = hir::GenericParamKind::Type {
                     default: default.as_ref().map(|x| {
-                        self.lower_ty(
-                            x,
-                            ImplTraitContext::OtherOpaqueTy {
-                                capturable_lifetimes: &mut FxHashSet::default(),
-                                origin: hir::OpaqueTyOrigin::Misc,
-                            },
-                        )
+                        self.lower_ty(x, ImplTraitContext::Disallowed(ImplTraitPosition::Other))
                     }),
                     synthetic: param
                         .attrs