[REPL] Autocompletion of `v = Module.Submodule.<TAB>` is broken

[giordano]

Yes another REPL autocompletion bug in 1.12. On both 49263b7 (release-1.12 branch) and a5157c0 (master)

platform = Base.BinaryPlatforms.<TAB>

doesn't complete anything. Can be reproduced with any Module.Submodule name, not just Base.BinaryPlatforms, that's just an example. Removing the left-hand side of the assignment solves the issue. This is of course a regression, used to work correctly in v1.11-. I believe this is distinct from all other bugs I reported.

[vtjnash]

I think Sam is working on a fix for all of these soon