Hash tokens containing dashes are incorrectly evaluated as colors

[andrew-skybound]

A hex color code immediately followed by a sequence of one or more dashes followed by a digit is evaluated as an addition or subtraction expression (depending upon the number of dashes). When a color code is followed by one or more dashes and an alpha character, however, the trail is appended to the end of the color code and the entire expression becomes a string. This is different from Ruby SASS, which always recognizes the entire sequence as an unquoted string.

Input:

.test {
    color: #aaabbb--1-2-a;
    color: type-of(#aaabbb--1-2-a);
    color: type-of(#aaabbb--1-2);
}

Ruby SASS:

.test {
  color: #aaabbb--1-2-a;
  color: string;
  color: string;
}

Libsass:

.test {
  color: #a9aaba-a;
  color: string;
  color: color;
}

[xzyfer]

@andrew-skybound thanks for the report. I can confirm this issue exists on the latest master.