ERROR: 0:3: 'line continuation' : not supported for this version or the enabled extensions 
ERROR: 0:6: '#error' : e1  
ERROR: 0:8: 'line continuation' : not supported for this version or the enabled extensions 
ERROR: 0:11: '#error' : e2  
ERROR: 0:13: 'line continuation' : not supported for this version or the enabled extensions 
ERROR: 0:14: 'line continuation' : not supported for this version or the enabled extensions 
ERROR: 0:15: 'line continuation' : not supported for this version or the enabled extensions 
ERROR: 0:18: '#error' : e3  
ERROR: 8 compilation errors.  No code generated.

ERROR: node is still EOpNull!
0:20  Function Definition: main( (void)
0:20    Function Parameters: 
0:20    Sequence
0:20      move second child to first child (highp 4-component vector of float)
0:20        'gl_Position' (gl_Position highp 4-component vector of float)
0:20        Construct vec4 (highp 4-component vector of float)
0:20          'foo' (highp float)
0:?   Linker Objects
0:?     'foo' (highp float)