Code compiled despite commented out

When following code is compiled and run all is normal:
Code:
void setup()
{
    pinMode(GREENLED, OUTPUT);
    Serial.println("\r\n*  Pinguino SD demo  *");
}

void loop()
{
    toggle(GREENLED);
    delay(500);
/*
//    SD.unmount();
*/
}
When the double slash is removed in front of "SD.unmount" the compile time is 
much longer and code will not run despite of this code is still commented out 
by the "/*" and "*/"-combination.
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Original issue reported on code.google.com by hgmvanbeek on 8 Apr 2012 at 4:09

mahmoud2 / pinguino32

Code compiled despite commented out #10