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#13780 caused several regressions and I think it is too restrictive as a fix.
I am reverting it and will be re-opening the original #11982 issue.
It would be good to get to the bottom of what the soundness problem hinted at
in #11982 is, and what a fix should be. As it stands #11982 is not obviously
a soundness problem but a separate compilation problem.
If the necessary fix is as restrictive as the one I reverted, we should wait until 3.2 to add it.
Fixes #15319
Also solves #15155 and reclassifies it as a pos test.
This is a more sweeping alternative of #15337. #15337 also fixes #15319 but leaves #15155 as an error.