[require]
GLSL >= 1.10

[vertex shader]
varying vec4 color;

void main()
{
    gl_Position = ftransform();
    color = vec4(1.0, 1.0, 0.0, 0.0);
}

[fragment shader]
/* Tests for what was a crasher bug in glsl_copy_propagation_elements */
varying vec4 color;

void main()
{
    vec4 col = color;
    for (int i = 0; i < 4; i++) {
        col.r = col.b;
    }
    gl_FragColor = col;
}

[test]
draw rect -1 -1 2 2
probe all rgba 0.0 1.0 0.0 0.0