parse default const parameters

[m4rch3n1ng]

fixes #228.

parse const parameter default assignments. specified in the reference it takes blocks, identifiers and literals (with optional minus).

also fixes some more of the mismatches from #229:

diff

--- .tmp/list.txt	2025-02-27 14:52:48.714795961 +0100
+++ .tmp/list.txt.default-const-params	2025-02-27 20:22:50.306213116 +0100
@@ -67,21 +67,12 @@
 tests/ui/coherence/coherence-overlap-negative-impls.rs
 tests/ui/const-generics/arg-in-pat-3.rs
 tests/ui/const-generics/const_trait_fn-issue-88433.rs
-tests/ui/const-generics/defaults/const-default.rs
 tests/ui/const-generics/defaults/const-param-as-default-value.rs
-tests/ui/const-generics/defaults/default-annotation.rs
-tests/ui/const-generics/defaults/repr-c-issue-82792.rs
 tests/ui/const-generics/defaults/rp_impl_trait.rs
 tests/ui/const-generics/defaults/trait_objects.rs
-tests/ui/const-generics/defaults/type-default-const-param-name.rs
-tests/ui/const-generics/generic_arg_infer/dont-use-defaults.rs
 tests/ui/const-generics/generic_const_exprs/drop_impl.rs
-tests/ui/const-generics/generic_const_exprs/inline-const-in-const-generic-defaults.rs
 tests/ui/const-generics/generic_const_exprs/issue-90847.rs
-tests/ui/const-generics/generic_const_exprs/unused-complex-default-expr.rs
 tests/ui/const-generics/issues/issue-88119.rs
-tests/ui/const-generics/min_const_generics/default_trait_param.rs
-tests/ui/const-generics/min_const_generics/type_and_const_defaults.rs
 tests/ui/consts/const-eval/issue-55541.rs
 tests/ui/consts/const-labeled-break.rs
 tests/ui/consts/trait_specialization.rs
@@ -136,8 +127,6 @@
 tests/ui/delegation/self-coercion.rs
 tests/ui/delegation/target-expr-pass.rs
 tests/ui/derives/derive-hygiene.rs
-tests/ui/derives/derive-macro-const-default.rs
-tests/ui/deriving/coerce-pointee-bounds-issue-127647.rs
 tests/ui/destructuring-assignment/struct_destructure.rs
 tests/ui/drop/dynamic-drop.rs
 tests/ui/dyn-compatibility/assoc_const_bounds.rs

[maxbrunsfeld]

Thanks so much for tracking the progress on the rustc files.

[m4rch3n1ng]

added the second part with type_parameter, updated tests, rebased on master and did tree-sitter generate. should be good to go now.

[maxbrunsfeld]

One more naming change. Thanks for addressing all of this feedback!

[maxbrunsfeld]

Thank you!