[Python-Dev] What is the purpose of NEXT_BLOCK()?

[Serhiy Storchaka]

21.03.18 17:13, Guido van Rossum пише:
> Maybe spelunking in the Python 2 branch will help? It seems it was 
> introduced in 2005 by Jeremy Hylton with this comment:
> 
> /* The distinction between NEW_BLOCK and NEXT_BLOCK is subtle.  (I'd
>     like to find better names.)  NEW_BLOCK() creates a new block and sets
>     it as the current block.  NEXT_BLOCK() also creates an implicit jump
>     from the current block to the new block.
> */
> 
> That comment (and NEW_BLOCK()) are no longer found in the Python 3 source.

It explains what NEXT_BLOCK() does, but not why it was needed to do this.

NEW_BLOCK() was never used at all.