Maps don't error out on comma-delineated non-parenthesized 'lists' as values

[mknadler]

A map value that is a comma-delineated 'list' that is not wrapped in parentheses, e.g.:

$map : ( 
  foo: bar, baz,
  foo2: bar2
);

Is being parsed as though the additional items in the list were keys with no paired values:

$map: (
  foo: bar,
  baz: null,
  foo2: bar2
);

test code:

$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);
}

ruby sass 3.4.14:

Invalid CSS after "  try: 1, two": expected ":", was ", 3,"

latest master:

test {
  a: 1;
  type: number;
  keys: a, two, 3, foo; }

[mknadler]

More generally, it looks like the issue is that maps accept keys without values in libsass but not ruby sass:

$map: (
  foo, 
  bar: baz
);

does not cause an error, but probably should?

[xzyfer]

Thanks for the report @mknadler. I can confirm this issue is still present on the latest master.

[mgreter]

@mknadler your findings are pretty much spot on, but actually libsass seems allow lists as keys.

[mgreter]

I opened an issue with ruby sass, since I think this is inconsistent and libsass does the right thing.