this code made Quartus freak out

linebuffer[xOffset+3]       = colors[0] ? linebuffer[xOffset+3] : cram[ (cramLine << 4) + colors[0] ];
linebuffer[xOffset+2]       = colors[1] ? linebuffer[xOffset+2] : cram[ (cramLine << 4) + colors[1] ];
linebuffer[xOffset+1]       = colors[2] ? linebuffer[xOffset+1] : cram[ (cramLine << 4) + colors[2] ];
linebuffer[xOffset]         = colors[3] ? linebuffer[xOffset]   : cram[ (cramLine << 4) + colors[3] ];