Fix Issue 17684 - [REG 2.062] static alias this (Part 2)

[JinShil]

Follow up to #7055.

I discovered that the implementation was still incomplete, and static alias this would not work with binary expressions (e.g. ==). This attempts to fix that.

I also added more tests in an attempt to be more thorough.

[dlang-bot]

Thanks for your pull request, @JinShil! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.

Some tips to help speed things up:

• smaller, focused PRs are easier to review than big ones

• try not to mix up refactoring or style changes with bug fixes or feature enhancements

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Bugzilla references

Auto-close	Bugzilla	Description
✓	17684	[REG 2.062] static alias this bug or incomplete implementation?