Cleanup and improve realizability (reopen #5558) #5727
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I had a TypeError crash in refchecks after screwing up a typeclass encoding in a particularly bad way. This commit reports an error instead.
Extracted from 7659c11.
A TermRef is stable if its underlying type is stable. Realizability should behave the same way. Part 1 of 9125f58.
I wrote this because I feared (incorrectly) exponential slowdowns in realizability checking for this code. But debugging suggests that the complexity of realizability checking is constant in the size of these expressions (even after I disable caching of `Stable`). Beware 1: these expressions almost smash the stack by sheer size. Beware 2: this fails with `-Yno-deep-subtypes`, but simply because the checking heuristics assumes people don't try to do this.
Also streamline logic significantly.
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This is just to show a snapshot of #5558 before the rebase; some excluded bits seem still useful.