[RFC][Post-Discussion]: E_WARNING when using array-index on non valid container

Hi all, Joe had requested renewed discussion on the accepted RFC[1] and my proposed PR[2] be brought forward again for implementation discussion, and to come up with a resolution. The RFC, though accepted, had concerns with implementation specifically related to suppression of multiple warnings for nested access of dim-fetching. I tried to mitigate and resolve the problems raised during the RFC process by ensuring only to raise for non-list() access, and only if the op1 of the next opcode is VAR and is the same opcode as the current one. This seems to suppress all warnings I could think of testing, but am not sure all potential use-cases of when we attempt to fetch for read. Any thoughts on a better implementation, or other use cases that need attention would be appreciated. Cheers -- Dave [1] - wiki [dot] php [dot] net/rfc/notice-for-non-valid-array-container [2] - github [dot] com/php/php-src/pull/2031