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+
+T15368.hs:9:15: warning: [-Wtyped-holes (in -Wdefault)]
+    • Found hole: _ :: (F a b, F a0 b0)
+      Where: ‘a0’ is an ambiguous type variable
+             ‘b0’ is an ambiguous type variable
+             ‘a’, ‘b’ are rigid type variables bound by
+               the type signature for:
+                 trigger :: forall a b. a -> b -> (F a b, F b a)
+               at T15368.hs:8:1-35
+    • In the first argument of ‘transitive’, namely ‘_’
+      In the expression: _ `transitive` trigger _ _
+      In an equation for ‘trigger’:
+          trigger _ _ = _ `transitive` trigger _ _
+    • Relevant bindings include
+        trigger :: a -> b -> (F a b, F b a) (bound at T15368.hs:9:1)
+
+T15368.hs:9:15: warning: [-Wdeferred-type-errors (in -Wdefault)]
+    • Couldn't match type ‘F b a’ with ‘F b0 a0’
+      Expected type: (F a b, F b a)
+        Actual type: (F a b, F b0 a0)
+      NB: ‘F’ is a non-injective type family
+      The type variables ‘b0’, ‘a0’ are ambiguous
+    • In the expression: _ `transitive` trigger _ _
+      In an equation for ‘trigger’:
+          trigger _ _ = _ `transitive` trigger _ _
+    • Relevant bindings include
+        trigger :: a -> b -> (F a b, F b a) (bound at T15368.hs:9:1)
+
+T15368.hs:9:38: warning: [-Wtyped-holes (in -Wdefault)]
+    • Found hole: _ :: a0
+      Where: ‘a0’ is an ambiguous type variable
+    • In the first argument of ‘trigger’, namely ‘_’
+      In the second argument of ‘transitive’, namely ‘trigger _ _’
+      In the expression: _ `transitive` trigger _ _
+    • Relevant bindings include
+        trigger :: a -> b -> (F a b, F b a) (bound at T15368.hs:9:1)
+
+T15368.hs:9:40: warning: [-Wtyped-holes (in -Wdefault)]
+    • Found hole: _ :: b0
+      Where: ‘b0’ is an ambiguous type variable
+    • In the second argument of ‘trigger’, namely ‘_’
+      In the second argument of ‘transitive’, namely ‘trigger _ _’
+      In the expression: _ `transitive` trigger _ _
+    • Relevant bindings include
+        trigger :: a -> b -> (F a b, F b a) (bound at T15368.hs:9:1)