Whitespaces in a property name do not fail

[seven-phases-max]

Example:

.for-each {
    me is not: a loop;
}

CSS output:

.for-each {
    meisnot: a loop;
}

Expected result:

a error message

This seems to be a regression of v2.0.0 (v1.7.5 works as expected).

[matthew-dean]

Had a look but couldn't spot anything obvious here: https://github.com/less/less.js/blob/master/lib/less/parser/parser.js#L1939

Maybe the match loop below? 🤔

[seven-phases-max]

At quick glance I guess it's about the match function at L1946
(original strict regex vs. whitespace-skipping-parser-function).