1#version 130 2 3void main() 4{ 5 float foo; 6 float undefinedThenDefined; 7 8 foo = undefinedThenDefined; 9 undefinedThenDefined = 2.0; 10 foo = undefinedThenDefined; 11 12 gl_Position = vec4(1.0); 13} 14 15