Only last set of box-shadow values being evaluated

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What steps will reproduce the problem?
1. Set a box-shadow with multiple shadows, using @def or @defmixin parameters.
2. All but the last shadow set will quote the names literally in the compiled 
output.

What is the expected output? What do you see instead?

All the colour constants should be evaluated, eg:

@def FG_LIGHT rgb(255,255,255);
@def FG_MID rgb(128,128,128);
@def FG_DARK rgb(71,71,71);

@defmixin boxshadow(COL1,COL2,COL3) {
box-shadow: inset 0px 0px 0px 1px COL1, inset 0px 2px 1px 0px COL2, inset 0px 
0px 0px 2px COL3;
}

@mixin boxshadow(FG_DARK,FG_LIGHT,FG_MID);
or
box-shadow: inset 0px 0px 0px 1px FG_DARK, inset 0px 2px 1px 0px FG_LIGHT, 
inset 0px 0px 0px 2px FG_MID;

Both should produce:

box-shadow: inset 0px 0px 0px 1px rgb(71,71,71), inset 0px 2px 1px 0px 
rgb(255,255,255), inset 0px 0px 0px 2px rgb(128,128,128);

however, both actually produce, respectively:

box-shadow: inset 0px 0px 0px 1px COL1, inset 0px 2px 1px 0px COL2, inset 0px 
0px 0px 2px rgb(128,128,128);

and

box-shadow: inset 0px 0px 0px 1px FG_DARK, inset 0px 2px 1px 0px FG_LIGHT, 
inset 0px 0px 0px 2px rgb(128,128,128);

What version of the product are you using? On what operating system?

Latest compiler (packaged 12/12/12), Windows 7 x64 with Java 7

Please provide any additional information below.

Original issue reported on code.google.com by zula...@gmail.com on 18 Jan 2013 at 10:12