import ast
def process(node):
  pass

def processComprehension( node, dest, expr ):
  finalLabel = ast.nextLabel()
  test = ast.evaluate(node.test)
  ast.outputInBlock( "unless %s, %s" % ( test, finalLabel ) )
  ast.outputInBlock( "%s.append( %s, %s )" % ( dest, dest, ast.evaluate( expr ) ) )
  ast.outputLabel( finalLabel )