330.frag
Warning, version 330 is not yet complete; some version-specific features are present, but many are missing.

0:? Sequence
0:8  Function Definition: main( (void)
0:8    Function Parameters: 
0:10    Sequence
0:10      move second child to first child (4-component vector of float)
0:10        'gl_FragColor' (fragColor 4-component vector of float)
0:10        'varyingVar' (smooth in 4-component vector of float)
0:11      move second child to first child (4-component vector of float)
0:11        direct index (4-component vector of float)
0:11          'gl_FragData' (fragColor 32-element array of 4-component vector of float)
0:11          Constant:
0:11            1 (const int)
0:11        'inVar' (smooth in 4-component vector of float)
0:12      Sequence
0:12        move second child to first child (int)
0:12          'buffer' (int)
0:12          Constant:
0:12            4 (const int)
0:21  Function Definition: foo( (void)
0:21    Function Parameters: 
0:23    Sequence
0:23      Sequence
0:23        move second child to first child (4-component vector of float)
0:23          'c' (4-component vector of float)
0:23          gl_Color: direct index for structure (in 4-component vector of float)
0:23            '__anon__0' (in block{gl_Color})
0:23            Constant:
0:23              0 (const uint)
0:24      move second child to first child (4-component vector of float)
0:24        'outVar' (out 4-component vector of float)
0:24        'inVar' (smooth in 4-component vector of float)
0:?   Linker Objects
0:?     'inVar' (smooth in 4-component vector of float)
0:?     'outVar' (out 4-component vector of float)
0:?     'varyingVar' (smooth in 4-component vector of float)
0:?     '__anon__0' (in block{gl_Color})


Linked fragment stage:

ERROR: Linking fragment stage: Cannot use gl_FragColor or gl_FragData when using user-defined outputs
ERROR: Linking fragment stage: Cannot use both gl_FragColor and gl_FragData