<===> input.scss
$map: (
  a: 1, two, 3,
  foo: 'bar'
);

test {
  a: map-get($map, a);
  type: type-of(map-get($map, a));
  keys: map-keys($map);
  try: map-get($map, two);
}

<===> error
Error: Invalid CSS after "  a: 1, two": expected ":", was ", 3,"
        on line 2 of input.scss
  Use --trace for backtrace.

<===> error-dart-sass
Error: expected ":".
  ,
2 |   a: 1, two, 3,
  |            ^
  '
  input.scss 2:12  root stylesheet