Fix class fields with arrays as generic type

[sadikovi]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions

Description of the Change

This PR fixes the scope of classes with generic type being an array, e.g. Foo<int[]>. It scopes properly with the actual assignment, but variable declaration was broken (IMHO, we just forgot to add it).

Fix is simply adding missing [ and ] to the pattern. It looked like when I added a test case I was using the wrong scopes, so I changed them to actual correct ones.

Before:

After:

Alternate Designs

None were considered, due to relatively simple change.

Benefits

Fixes a bug with scoping generics with arrays.

Possible Drawbacks

None were found.

Applicable Issues

Closes #139

[sadikovi]

@50Wliu could you have a look at this PR? Thanks!

[winstliu]

Does this need to be changed anywhere else (for example, lookaheads)?

[sadikovi]

I also tested the fix manually on different examples of initialising variables, so far this change has been enough to provide correct scope and highlighting.

[sadikovi]

I do not think we need to change in other places, since manual tests worked and unit tests pass. I suggest we address any other issues in follow-up PRs.

[winstliu]

Sounds good.