I know it's been reported already but bugs were closed due to insufficient information.

I have the following CSS code:

#id1 {
    position: fixed;
    left: 0; top: 0;
    width: 130px;
}
#id2 {
    position: fixed;
    right: 0; top: 0;
    width: calc(100% - 130px);
}

I wanted to transform it into LESS using 130px as a parameter but calc gets internpreted by LESS and this:

@id1width: 130px
#id1 {
    position: fixed;
    left: 0; top: 0;
    width: @id1width;
}
#id2 {
    position: fixed;
    right: 0; top: 0;
    width: calc(100% - @id1width);
}

makes the last but one line transformed to width: calc(-30%); which is clearly not what's desired. I tried using width: ~"calc(100% - @id1width)"; but it makes @id1width not interpreted.

I think LESS shouldn't use things reserved by CSS3 for its internal use...