Syntax errors for new associated type `where` clause position

[MingweiSamuel]

Associated type syntax has changed so the where clause comes after the assignment instead of before:

• Proposal: Change syntax of where clauses on type aliases rust#89122
• Change location of where clause on GATs rust#90076

Minimized example code:

pub trait Trait {
    type AssociatedType where Self: Clone;
}

impl Trait for () {
    type AssociatedType = () where Self: Clone;
}

Result:

Syntax Error: expected SEMICOLON

Syntax Error: expected an item

Syntax Error: expected BANG
Syntax Error: expected `{`, `[`, `(`
Syntax Error: expected SEMICOLON
Syntax Error: expected an item

Syntax Error: expected BANG
Syntax Error: expected `{`, `[`, `(`

rust-analyzer version:

5fae65dd2 2022-03-07 stable
5fae65dd2 2022-03-07 nightly

rustc version: rustc 1.61.0-nightly (38a0b81b1 2022-03-06)

relevant settings: N/A

[MingweiSamuel]

A simpler example:

type X = () where X: Copy;

Should parse, but isn't valid:

error: where clause not allowed here
 --> src/lib.rs:1:13
  |
1 | type X = () where X: Copy;
  |       -     ^^^^^^^^^^^^^
  |       |
  |       help: move it here: `where X: Copy`

However rust-analyzer does not parse it