### Compilation failed:

error: 1: invalid type
layout(binding=0) sampler2D t;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: 4: unknown identifier 'sampleGrad'
    return sampleGrad(t, coords, dFdx(coords), dFdy(coords));
           ^^^^^^^^^^
error: 4: unknown identifier 't'
    return sampleGrad(t, coords, dFdx(coords), dFdy(coords));
                      ^
3 errors