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type variable out of scope in worker/wrapper transformation

I ran into a bug while using type families in an array library that I'm writing. The original error looked something like:

Declaration for $wslice:
  Iface type variable out of scope:  s

I've tried to strip down the code as much as possible into the attached cabal package with two modules. The package builds itself with -dcore-lint and -O2; so just running cabal install inside of the package should cause a Core Lint error.

Let me know if there's any more information I can provide to help diagnose this issue.

Trac metadata
Trac field Value
Version 6.10.3
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
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Blocking
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