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| -rw-r--r-- | compiler/GHC/Tc/Utils/TcMType.hs | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/GHC/Tc/Utils/TcMType.hs b/compiler/GHC/Tc/Utils/TcMType.hs index ccb9152e01..4d2bebe189 100644 --- a/compiler/GHC/Tc/Utils/TcMType.hs +++ b/compiler/GHC/Tc/Utils/TcMType.hs @@ -1230,6 +1230,9 @@ We do this eager erroring in candidateQTyVars, which always precedes generalisation, because at that moment we have a clear picture of what skolems are in scope within the type itself (e.g. that 'forall arg'). +This change is inspired by and described in Section 7.2 of "Kind Inference +for Datatypes", POPL'20. + Wrinkle: We must make absolutely sure that alpha indeed is not |