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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 /testsuite/tests/unboxedsums/UnboxedSumsTH_Fail.hs | |
| 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 'testsuite/tests/unboxedsums/UnboxedSumsTH_Fail.hs')
| -rw-r--r-- | testsuite/tests/unboxedsums/UnboxedSumsTH_Fail.hs | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/testsuite/tests/unboxedsums/UnboxedSumsTH_Fail.hs b/testsuite/tests/unboxedsums/UnboxedSumsTH_Fail.hs new file mode 100644 index 0000000000..46ed1c13c1 --- /dev/null +++ b/testsuite/tests/unboxedsums/UnboxedSumsTH_Fail.hs @@ -0,0 +1,13 @@ +{-# LANGUAGE MagicHash #-} +{-# LANGUAGE TemplateHaskell #-} +{-# LANGUAGE UnboxedSums #-} + +module UnboxedSumsTH_Fail where + +import Data.Proxy +import Language.Haskell.TH + +-- (# | #) is not a valid data constructor, +-- as it doesn't indicate which alternative we are taking. +testDC :: (# Integer | Bool #) +testDC = $( conE '(# | #) `appE` litE (IntegerL 77) ) |