GHC version 9.4.4: heap overflow; the same with 9.6.1, but 9.2.7 compiles fine

Summary

Heap overflow when compiling, both with -O0 and with -O1.

Edit: Disclaimer: lots of UndecidableInstances in this code, though not in the file on which GHC diverges.

Clone this repo at this commit

then run (you can ignore cabal.project, the fork of mnist-idx is no longer needed)

cabal build -j1 --disable-optimization

Or any other build invocation. I haven't found a set of options for which it does compile.

Compiles.

Fails the same with 9.4.4 and 9.6.1 (with --allow-newer). Fails the same in CI:

Compiles and all tests pass with 9.2.7.

Edited Mar 24, 2023 by Mikolaj Konarski

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