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| author | Simon Peyton Jones <simonpj@microsoft.com> | 2015-05-07 16:46:02 +0100 |
|---|---|---|
| committer | Ben Gamari <ben@smart-cactus.org> | 2015-10-22 14:26:46 +0200 |
| commit | 9b0d901bc996ee21979e86c71a90f404a5225e86 (patch) | |
| tree | 5646d4df209ed9d772f14b1403cd3461c561095d | |
| parent | 3f3ac1cb6661f7b1780ea17abcce21f4a36dcea5 (diff) | |
| download | haskell-9b0d901bc996ee21979e86c71a90f404a5225e86.tar.gz | |
Regression test for Trac #10390
| -rw-r--r-- | testsuite/tests/typecheck/should_compile/T10390.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/T10390.hs b/testsuite/tests/typecheck/should_compile/T10390.hs new file mode 100644 index 0000000000..e0648c9554 --- /dev/null +++ b/testsuite/tests/typecheck/should_compile/T10390.hs @@ -0,0 +1,16 @@ +{-# LANGUAGE RankNTypes #-} + +module T10390 where + +class ApPair r where + apPair :: (forall a . (ApPair a, Num a) => Maybe a) -> Maybe r + +instance (ApPair a, ApPair b) => ApPair (a,b) where + apPair = apPair' + +apPair' :: (ApPair b, ApPair c) + => (forall a . (Num a, ApPair a) => Maybe a) -> Maybe (b,c) + -- NB constraints in a different order to apPair +apPair' f = let (Just a) = apPair f + (Just b) = apPair f + in Just $ (a, b) diff --git a/testsuite/tests/typecheck/should_compile/all.T b/testsuite/tests/typecheck/should_compile/all.T index bf0e0a0eca..33fff944a5 100644 --- a/testsuite/tests/typecheck/should_compile/all.T +++ b/testsuite/tests/typecheck/should_compile/all.T @@ -446,3 +446,4 @@ test('T10109', normal, compile, ['']) test('T10335', normal, compile, ['']) test('T10489', normal, compile, ['']) test('T10564', normal, compile, ['']) +test('T10390', normal, compile, ['']) |