ERROR: 0:5: 'a' : redefinition 
ERROR: 0:17: 'b' : illegal redeclaration 
ERROR: 0:19: 'f' : redefinition 
ERROR: 0:50: 'z' : undeclared identifier 
ERROR: 0:50: 'z' : redefinition 
ERROR: 5 compilation errors.  No code generated.

ERROR: node is still EOpNull!
0:3  Function Definition: f(i1;i1;i1; (int)
0:3    Function Parameters: 
0:3      'a' (in int)
0:3      'b' (in int)
0:3      'c' (in int)
0:?     Sequence
0:8      Sequence
0:8        Sequence
0:8          move second child to first child (float)
0:8            'a' (float)
0:8            add (float)
0:8              Convert int to float (float)
0:8                'a' (in int)
0:8              Constant:
0:8                1.000000
0:11      Branch: Return with expression
0:11        'a' (in int)
0:22  Function Definition: cos(f1; (float)
0:22    Function Parameters: 
0:22      'x' (in float)
0:24    Sequence
0:24      Branch: Return with expression
0:24        Constant:
0:24          1.000000
0:29  Function Definition: main( (void)
0:29    Function Parameters: 
0:?     Sequence
0:32      Function Call: g( (int)
0:35      'sin' (float)
0:37      Function Call: f(i1;i1;i1; (int)
0:37        Constant:
0:37          1 (const int)
0:37        Constant:
0:37          2 (const int)
0:37        Constant:
0:37          3 (const int)
0:40      move second child to first child (float)
0:40        'f' (float)
0:40        Constant:
0:40          3.000000
0:42      move second child to first child (4-component vector of float)
0:42        'gl_Position' (invariant gl_Position 4-component vector of float)
0:42        Construct vec4 (4-component vector of float)
0:42          'f' (float)
0:44      Sequence
0:44        Sequence
0:44          move second child to first child (int)
0:44            'f' (int)
0:44            Constant:
0:44              0 (const int)
0:44        Loop with condition tested first
0:44          Loop Condition
0:44          Compare Less Than (bool)
0:44            'f' (int)
0:44            Constant:
0:44              10 (const int)
0:44          Loop Body
0:45          Pre-Increment (int)
0:45            'f' (int)
0:44          Loop Terminal Expression
0:44          Pre-Increment (int)
0:44            'f' (int)
0:47      Sequence
0:47        move second child to first child (int)
0:47          'x' (int)
0:47          Constant:
0:47            1 (const int)
0:49      Sequence
0:49        Sequence
0:49          move second child to first child (float)
0:49            'x' (float)
0:49            Constant:
0:49              2.000000
0:49          move second child to first child (float)
0:49            'y' (float)
0:49            'x' (float)
0:53      Sequence
0:53        Sequence
0:53          move second child to first child (int)
0:53            'x' (int)
0:53            'x' (int)
0:61      Sequence
0:61        Sequence
0:61          move second child to first child (structure)
0:61            'S' (structure)
0:61            Constant:
0:61              0 (const int)
0:62        x: direct index for structure (int)
0:62          'S' (structure)
0:62          Constant:
0:62            0 (const int)
0:?   Linker Objects
0:?     'b' (bool)
0:?     'tan' (float)
0:?     'gl_VertexID' (gl_VertexId int)
0:?     'gl_InstanceID' (gl_InstanceId int)