[scss] (dart) sass module system parsing issues

[joneff]

Steps to Reproduce:

1. Write the following

@use "lib";
lib.$var: $other-var; // identifier expected @ $var

@if $condition {
    lib.$var: $other-var; // colon expected @ . semicolon expected @ $other-var
} // atrule or selector expected

2. Here be warnings warnings

Bullet 1 is probably related to, if not duplicate of, #224. I've not seen the second issue reported.

[DanKaplanSES]

Since this title falls under the umbrella of any scss parsing issue, I'd like to add my own:

  $map-with-list-as-key: (
    [ '', // ] expectedscss(css-lbracketexpected)
    '' ]: // ) expectedscss(css-rparentexpected)
      1,
    [ '',
    '.foo' ]:
      2,
  );

This is valid scss, but VS code marks it as an error.