### Compilation failed:

error: 2: variables of type 'uint2' may not be uniform
uniform uint2 c, d;
^^^^^^^^^^^^^^^
error: 2: variables of type 'uint2' may not be uniform
uniform uint2 c, d;
                 ^
error: 4: 'main' must return: 'vec4', 'float4', or 'half4'
void main() {
^^^^^^^^^^^
error: 9: unknown identifier 'sk_FragColor'
    sk_FragColor.x = greaterThan(a, b).x ? 1 : 0;
    ^^^^^^^^^^^^
error: 10: unknown identifier 'sk_FragColor'
    sk_FragColor.y = greaterThan(c, d).y ? 1 : 0;
    ^^^^^^^^^^^^
error: 11: unknown identifier 'sk_FragColor'
    sk_FragColor.z = greaterThan(e, f).z ? 1 : 0;
    ^^^^^^^^^^^^
error: 12: unknown identifier 'sk_FragColor'
    sk_FragColor.w = any(expectTTFF) || any(expectFFTT) ? 1 : 0;
    ^^^^^^^^^^^^
7 errors