ERROR: 0:5: 'barrier' : no matching overloaded function found 
ERROR: 1 compilation errors.  No code generated.

ERROR: node is still EOpNull!
0:3  Function Definition: main( (void)
0:3    Function Parameters: 
0:5    Sequence
0:5      Constant:
0:5        0.000000
0:?   Linker Objects