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| author | sheaf <sam.derbyshire@gmail.com> | 2023-05-13 15:59:10 +0200 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2023-05-13 14:59:13 -0400 |
| commit | a5451438bcf3a912910e7c2a5d40dfedfa7d1a4a (patch) | |
| tree | 8d5a13a1a00bc50b31adadcf38b7f8e0970fdb4f /compiler/GHC/Core/Coercion.hs-boot | |
| parent | 902f0730b4c50f39b7767a346be324c98bf7a8a6 (diff) | |
| download | haskell-a5451438bcf3a912910e7c2a5d40dfedfa7d1a4a.tar.gz | |
Fix bad multiplicity role in tyConAppFunCo_maybe
The function tyConAppFunCo_maybe produces a multiplicity coercion
for the multiplicity argument of the function arrow, except that
it could be at the wrong role if asked to produce a representational
coercion. We fix this by using the 'funRole' function, which computes
the right roles for arguments to the function arrow TyCon.
Fixes #23386
Diffstat (limited to 'compiler/GHC/Core/Coercion.hs-boot')
| -rw-r--r-- | compiler/GHC/Core/Coercion.hs-boot | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/GHC/Core/Coercion.hs-boot b/compiler/GHC/Core/Coercion.hs-boot index 3143414feb..276a48cf81 100644 --- a/compiler/GHC/Core/Coercion.hs-boot +++ b/compiler/GHC/Core/Coercion.hs-boot @@ -36,6 +36,8 @@ mkSubCo :: HasDebugCallStack => Coercion -> Coercion mkProofIrrelCo :: Role -> Coercion -> Coercion -> Coercion -> Coercion mkAxiomRuleCo :: CoAxiomRule -> [Coercion] -> Coercion +funRole :: Role -> FunSel -> Role + isGReflCo :: Coercion -> Bool isReflCo :: Coercion -> Bool isReflexiveCo :: Coercion -> Bool |