matcher openmp directive

Hi there:

i try to match an openmp directive using AST Matcher, but i can not make it.

for example:

{

#pragma omp parallel
{

}

}

how to match this node?

this node should be a STMT in AST, i can see this in RecursiveASTVisitor.h :
DEF_TRAVERSE_STMT(OMPParallelDirective,
{ TRY_TO(TraverseOMPExecutableDirective(S)); })

so how to narrow down the stmt() matcher to get this node?

Best

hui