On Wednesday, 27 October 2021 at 01:58:07 UTC, zjh wrote: > On Wednesday, 27 October 2021 at 01:17:54 UTC, zjh wrote: while the old `std`, you only need to add `using std = std2021;`, Then change it to our forwarding code(compile time forwarding). Through compile time forwarding, the user's code speed should not change.