_fn.py 文件源码

def _is_unascribed_match_head(cls, e):
        if isinstance(e, ast.Subscript):
            value = e.value
            if isinstance(value, ast.Name) and value.id == 'match':
                slice = e.slice
                if isinstance(slice, ast.Index):
                    e.is_match_head = True
                    e.scrutinee = slice.value
                    e.asc_ast = None
                    return True
                else:
                    raise _errors.TyError("Invalid match scrutinee.", e)
        return False