### Compilation failed:

error: 1: interface blocks are not allowed in this kind of program
layout(binding=0) uniform testBlock {
                          ^^^^^^^^^
error: 8: 'main' must return: 'vec4', 'float4', or 'half4'
void main() {
^^^^^^^^^^^
error: 9: unknown identifier 'sk_FragColor'
    sk_FragColor = half4(x, y[0], y[1], 0);
    ^^^^^^^^^^^^
error: 9: unknown identifier 'x'
    sk_FragColor = half4(x, y[0], y[1], 0);
                         ^
error: 9: unknown identifier 'y'
    sk_FragColor = half4(x, y[0], y[1], 0);
                            ^
error: 9: unknown identifier 'y'
    sk_FragColor = half4(x, y[0], y[1], 0);
                                  ^
6 errors