On Fri, 12 Mar 2021, ÉRDI Gergő wrote:
I wonder why that is? What changed between GHC 8.10.3 and 9.0.1? Was the
definition of `elem` changed in `base`?
Oh, I've found this commit:
```
commit f10d11fa49fa9a7a506c4fdbdf86521c2a8d3495
Author: Andreas Klebinger <klebinger.andr...@gmx.at>
Date: Wed Jan 29 15:25:07 2020 +0100
Fix "build/elem" RULE.
An redundant constraint prevented the rule from matching.
Fixing this allows a call to elem on a known list to be translated
into a series of equality checks, and eventually a simple case
expression.
[...]
```_______________________________________________
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