Merge #2724

2724: Improve const generic parsing r=matklad a=mchesser

Add support for generic arguments in:

`impl` type parameters:

```rust
impl<const N: u32> Bar<N> {}
```

type args:

```rust
type A = B<1, { 2 }>;
test::<10>();
```

Co-authored-by: Michael Chesser <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/crates/ra_parser/src/syntax_kind/generated.rs b/crates/ra_parser/src/syntax_kind/generated.rs
index 262c545e4..4b301d67a 100644
--- a/crates/ra_parser/src/syntax_kind/generated.rs
+++ b/crates/ra_parser/src/syntax_kind/generated.rs
@@ -234,6 +234,7 @@ pub enum SyntaxKind {
     LIFETIME_ARG,
     TYPE_ARG,
     ASSOC_TYPE_ARG,
+    CONST_ARG,
     PARAM_LIST,
     PARAM,
     SELF_PARAM,