fn: gcc.Function('main')
fn.decl.name: 'main'
return type: 'int'
argument types: ['int', 'char * *']
gimple[0]:
  str(stmt): '__builtin_puts (&"Hello, python"[0]);'
  repr(stmt): 'gcc.GimpleCall()'
  type(stmt.fn): <type 'gcc.AddrExpr'>
  str(stmt.fn): '__builtin_puts'
  str(stmt.args[0]): '&"Hello, python"[0]'
  str(stmt.lhs): None
gimple[1]:
  str(stmt): 'return;'
  repr(stmt): 'gcc.GimpleReturn()'