@meta.hook(BasicParser, "<STR_LIT>")<EOL>def get_subnode(self, dst, ast, expr):
dst.value = eval('<STR_LIT>' + expr)<EOL>return True<EOL>
get the value of subnode

example::

    R = [
        __scope__:big  getsomethingbig:>big
        #get(_, big, '.val') // copy big.val into _
    ]