Disallow an unspaced operator within calc functions.
a { top: calc(1px + 2px); }
/** ↑
* The space around this operator */The following patterns are considered warnings:
a { top: calc(1px+2px); }a { top: calc(1px+ 2px); }The following patterns are not considered warnings:
a { top: calc(1px + 2px); }a { top: calc(calc(1em * 2) / 3); }