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| author | Matthew Pickering <matthewtpickering@gmail.com> | 2022-07-19 17:06:41 +0100 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2022-07-25 09:42:01 -0400 |
| commit | 671899858585376dcbbbdc3740dad4b8ec7b6a70 (patch) | |
| tree | 3f963ced252f0f1c304635c4e6cf9595e87d9dc8 | |
| parent | e31ead39331f1bb6d3976ae7573be8fe2b364172 (diff) | |
| download | haskell-671899858585376dcbbbdc3740dad4b8ec7b6a70.tar.gz | |
Add DeepSubsumption08
| -rw-r--r-- | testsuite/tests/typecheck/should_compile/DeepSubsumption08.hs | 16 | ||||
| -rw-r--r-- | testsuite/tests/typecheck/should_compile/all.T | 1 |
2 files changed, 17 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_compile/DeepSubsumption08.hs b/testsuite/tests/typecheck/should_compile/DeepSubsumption08.hs new file mode 100644 index 0000000000..d4019df3d8 --- /dev/null +++ b/testsuite/tests/typecheck/should_compile/DeepSubsumption08.hs @@ -0,0 +1,16 @@ +{-# LANGUAGE RankNTypes #-} +{-# LANGUAGE Haskell2010 #-} +module DeepSubsumption08 where + +class (Traversable f, Applicative f) => Identical f where + extract :: f a -> a + +type LensLike f s t a b = (a -> f b) -> (s -> f t) +type Setter s t a b = forall f. Identical f => LensLike f s t a b + +(.~) :: Setter s t a b -> b -> s -> t +(.~) a = undefined + +-- | Sets the provided lens in @a@ to @Nothing@. +clear :: Setter a a' b (Maybe b') -> a -> a' +clear = (.~ Nothing) diff --git a/testsuite/tests/typecheck/should_compile/all.T b/testsuite/tests/typecheck/should_compile/all.T index 3071562989..2d919a9c14 100644 --- a/testsuite/tests/typecheck/should_compile/all.T +++ b/testsuite/tests/typecheck/should_compile/all.T @@ -851,3 +851,4 @@ test('DeepSubsumption04', normal, compile, ['']) test('DeepSubsumption05', normal, compile, ['']) test('DeepSubsumption06', normal, compile, ['-XHaskell98']) test('DeepSubsumption07', normal, compile, ['-XHaskell2010']) +test('DeepSubsumption08', normal, compile, ['']) |