haskell.md - #316
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…Hopper Ran the entire documented sequence verbatim on Hopper: module load ghcup -> ghcup install ghc 9.10.1 -> stack new matmul new-template -> edit app/Main.hs and package.yaml exactly as shown -> stack build. Found the real bug the doc had: stack manages its own GHC install, independent of ghcup, chosen by whatever the Stackage LTS snapshot resolver needs (currently ghc-9.10.3 for the snapshot stack new picks by default) - not whatever version was just installed with ghcup. The doc's ghcup step installs 9.10.1 but the sample find output showed ghc-9.6.5, a third, unrelated number. Added a note explaining stack/ghcup are independent here, and updated the find/run example paths to the version actually observed (ghc-9.10.3), noting this number will keep drifting as Stackage's default snapshot updates over time. The build succeeded and produced the exact 4x4 matrix output already documented, unchanged. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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August 4, 2026 02:43
Graviton28
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August 4, 2026 04:54
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found and fixed the version inconsistency flagged for this file: stack manages its own ghc toolchain completely independently of ghcup. it picks whatever ghc the stackage lts snapshot resolver needs at stack new time (currently resolves to ghc-9.10.3), not the version you just installed with ghcup (9.10.1 per the doc), and not the 9.6.5 an older revision of this doc showed either. all three numbers were real observations from different points in time, just not causally related the way the doc implied. added a note clarifying stack and ghcup are independent here, and corrected the example find/run paths to the version actually observed.
build succeeded and produced the exact 4x4 matrix output already documented, confirmed still working. the package.yaml edit (adding matrix under the matmul-exe executable's dependencies) worked exactly as documented, no changes needed there.