Test Trac #11248, #11249

testsuite/tests/polykinds/T11248.hs

+{-# LANGUAGE DataKinds, TypeOperators, TypeFamilies,
+             KindSignatures, ConstraintKinds #-}
+
+module T11248 where
+
+import GHC.TypeLits
+
+type a / b = FDiv a b
+type a ** b = FMul a b
+
+type family FDiv a b where
+  FDiv 11648 128 = 91
+
+type family FMul a b where
+  FMul 64 91 = 5824
+
+type family FGCD a b where
+  FGCD 128 448 = 64
+  FGCD 128 5824 = 64
+
+type family FLCM a b where
+  FLCM 128 5824 = 11648
+
+data CT (m :: Nat) (m' :: Nat)
+type H0 = 128
+type H1 = 448
+type H0' = 11648
+type H1' = 5824
+
+main' = let x = undefined :: CT H0 H0'
+        in foo x :: CT H1 H1'
+
+foo x = bug x
+
+type Ctx2 e r s e' r' =
+  (e ~ FGCD r e', r' ~ FLCM r e', e ~ FGCD r s)
+
+type Ctx1 e r s e' r' =
+  (Ctx2 e r s e' r', e' ~ (e ** (r' / r)))
+
+bug :: (Ctx1 e r s e' r')
+  => CT r r' -> CT s s'
+bug = undefined

testsuite/tests/polykinds/T11249.hs

+{-# LANGUAGE DataKinds, TypeOperators, TypeFamilies,
+             KindSignatures, ConstraintKinds #-}
+
+module T11249 where
+
+import GHC.TypeLits
+
+type a / b = FDiv a b
+type a ** b = FMul a b
+
+type family FDiv a b where
+  FDiv 11648 128 = 91
+
+type family FMul a b where
+  FMul 64 91 = 5824
+
+type family FGCD a b where
+  FGCD 128 448 = 64
+  FGCD 128 5824 = 64
+
+type family FLCM a b where
+  FLCM 128 5824 = 11648
+
+data CT (m :: Nat) (m' :: Nat)
+type H0 = 128
+type H1 = 448
+type H0' = 11648
+type H1' = 5824
+
+main' = let x = undefined :: CT H0 H0'
+        in foo x :: CT H1 H1'
+
+foo x = bug x
+
+type Ctx2 e r s e' r' =
+  (e ~ FGCD r e', r' ~ FLCM r e', e ~ FGCD r s)
+
+bug :: (Ctx2 e r s e' r', e' ~ (e ** (FDiv r' r)))
+  => CT r r' -> CT s s'
+bug = undefined

testsuite/tests/polykinds/all.T

@@ -127,3 +127,6 @@ test('T11142', normal, compile_fail, [''])
 test('SigTvKinds', normal, compile, [''])
 test('SigTvKinds2', expect_broken(11203), compile_fail, [''])
 test('T9017', normal, compile_fail, [''])
+test('T11249', normal, compile, [''])
+test('T11248', normal, compile, [''])
+