Debugging a Heisenbug. Among other efforts to probe it, making a small change to an unrelated function makes it go away. Years ago, I'd have left it at that... but now I'm not going to sleep until I know what's going on...
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Replying to @edwinbrady
So that "unrelated function" is apparently not so unrelated after all?
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Replying to @jer_gib
The evidence suggests that it's important, certainly. But it's not a specific unrelated function. Lots of things have the same effect. For example: map f (map g xs) -- crashes map (f . g) xs -- doesn't crash I guess this is the runtime trying to teach me good style :)
2:12 PM - 24 Apr 2019
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