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Diffstat (limited to 'testsuite/tests/dependent/should_fail/T14066c.hs')
| -rw-r--r-- | testsuite/tests/dependent/should_fail/T14066c.hs | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/testsuite/tests/dependent/should_fail/T14066c.hs b/testsuite/tests/dependent/should_fail/T14066c.hs new file mode 100644 index 0000000000..4dd6f41973 --- /dev/null +++ b/testsuite/tests/dependent/should_fail/T14066c.hs @@ -0,0 +1,9 @@ +{-# LANGUAGE TypeFamilies, DataKinds, PolyKinds, UndecidableInstances #-} + +module T14066c where + +type family H a b where + H a b = H b a + +type X = H True Nothing -- this should fail to kind-check. + -- if it's accepted, then we've inferred polymorphic recursion for H |