1 2out vec4 sk_FragColor; 3vec4 main() { 4 float x; 5 float y; 6 x = (y = 1.0); 7 float a; 8 float b; 9 float c; 10 a = (b = (c = 0.0)); 11 return vec4(a * b, x, c, y); 12} 13