### Compilation failed:

error: 1: 'in' is not permitted here
layout(location=0) in float defaultVarying;
^^^^^^^^^^^^^^^^^^^^^
error: 1: layout qualifier 'location' is not permitted here
layout(location=0) in float defaultVarying;
^^^^^^^^^^^^^^^^^^^^^
error: 2: 'in' is not permitted here
layout(location=1) in noperspective float linearVarying;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: 2: 'noperspective' is not permitted here
layout(location=1) in noperspective float linearVarying;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: 2: layout qualifier 'location' is not permitted here
layout(location=1) in noperspective float linearVarying;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: 3: 'in' is not permitted here
layout(location=2) in flat float flatVarying;
^^^^^^^^^^^^^^^^^^^^^^^^^^
error: 3: 'flat' is not permitted here
layout(location=2) in flat float flatVarying;
^^^^^^^^^^^^^^^^^^^^^^^^^^
error: 3: layout qualifier 'location' is not permitted here
layout(location=2) in flat float flatVarying;
^^^^^^^^^^^^^^^^^^^^^^^^^^
error: 5: 'main' must return: 'vec4', 'float4', or 'half4'
void main() {
^^^^^^^^^^^
error: 6: unknown identifier 'sk_FragColor'
    sk_FragColor = half4(defaultVarying, linearVarying, flatVarying, 1.0);
    ^^^^^^^^^^^^
10 errors