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| author | sheaf <sam.derbyshire@gmail.com> | 2022-01-11 10:42:17 +0100 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2022-01-11 19:42:07 -0500 |
| commit | 34d8bc24e33aa373acb6fdeef51427d968f28c0c (patch) | |
| tree | 4eb89724f1b4e9e24ac3dc315497a5071ef463ef /compiler/GHC/Driver | |
| parent | addf8e544841a3f7c818331e47fa89a2cbfb7b29 (diff) | |
| download | haskell-34d8bc24e33aa373acb6fdeef51427d968f28c0c.tar.gz | |
Fix parsing & printing of unboxed sums
The pretty-printing of partially applied unboxed sums was incorrect,
as we incorrectly dropped the first half of the arguments, even
for a partial application such as
(# | #) @IntRep @DoubleRep Int#
which lead to the nonsensical (# DoubleRep | Int# #).
This patch also allows users to write unboxed sum type constructors
such as
(# | #) :: TYPE r1 -> TYPE r2 -> TYPE (SumRep '[r1,r2]).
Fixes #20858 and #20859.
Diffstat (limited to 'compiler/GHC/Driver')
| -rw-r--r-- | compiler/GHC/Driver/Session.hs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/compiler/GHC/Driver/Session.hs b/compiler/GHC/Driver/Session.hs index b0b37a822c..780a38e3d7 100644 --- a/compiler/GHC/Driver/Session.hs +++ b/compiler/GHC/Driver/Session.hs @@ -3851,6 +3851,10 @@ impliedXFlags , (LangExt.TemplateHaskell, turnOn, LangExt.TemplateHaskellQuotes) , (LangExt.Strict, turnOn, LangExt.StrictData) + -- Historically only UnboxedTuples was required for unboxed sums to work. + -- To avoid breaking code, we make UnboxedTuples imply UnboxedSums. + , (LangExt.UnboxedTuples, turnOn, LangExt.UnboxedSums) + -- The extensions needed to declare an H98 unlifted data type , (LangExt.UnliftedDatatypes, turnOn, LangExt.DataKinds) , (LangExt.UnliftedDatatypes, turnOn, LangExt.StandaloneKindSignatures) |