_product.py 文件源码

def syn_Subscript(self, ctx, e):
        slice_ = e.slice
        if not isinstance(slice_, ast.Index):
            raise _errors.TyError("Must provide a single label.", slice_)
        value = slice_.value
        label = _read_label(value)
        try:
            ty = self.idx[label]
        except KeyError:
            raise _errors.TyError("Cannot project component labeled " + str(label), e)
        value.label = label
        return ty