WARNING: 0:1: '#version' : statement missing: use #version on first line of shader 
ERROR: 0:1: 'main' : function cannot take any parameter(s) 
ERROR: 0:1: 'int' :  main function cannot return a value
ERROR: 2 compilation errors.  No code generated.

0:1Function Definition: main(i1; (mediump int)
0:1  Function Parameters: 
0:1    'foo' (in mediump int)
0:3  Sequence
0:3    Branch: Return with expression
0:3      1 (const int)