Variable calculations inside `calc()` not calculated.

Test Case

@a: 10px;
@b: 10px;

.one {
	width: calc(100% - ((@a + @b)));
}

Expected Output (& Output for v2.7.1)

.one {
  width: calc(100% - 20px);
}

Actual Output (lessc v 3.0.4)

(Command: lessc -sm=on test.less > test.css)

.one {
  width: calc(100% - 10px + 10px);
}

[matthew-dean]

So, I slightly misunderstood this, but it’s working as expected. Essentially, the calc() bug was recently fixed and no math is performed within calc(). But functions within calc() will still perform math on their arguments (unless the inner function is also calc).

Meaning, you can hack 2.x behavior with:

.one {
	width: calc(100% - (min(@a + @b)));
}

But there’s no need, since the calculated result is the same.

[mikejf-pr]

@matthew-dean I’m troubled by the lack of evaluation even for negative variables, as that’s not really something that can be properly handled at the moment. If we have a simple

@a: -4px;
div {
	margin-right: calc(0px - @a);
}

the resultant output is

div {
  margin-right: calc(0px - -4px);
}

It would seem to me that LESS should handle signage flips as part of the variable insertion.