Test Trac #8799, #8555

testsuite/tests/typecheck/should_compile/T8555.hs

+{-# LANGUAGE FlexibleContexts #-}
+
+module T8555 where
+import Data.Coerce
+
+foo :: Coercible [a] [b] => a -> b
+foo = coerce

testsuite/tests/typecheck/should_compile/T8799.hs

+{-# LANGUAGE FlexibleContexts #-}
+
+module T8555 where
+import Data.Coerce
+
+foo :: Coercible a b => b -> a
+foo = coerce
+
+bar :: (Coercible a b, Coercible b c) => b -> c -> a
+bar b c = coerce c

testsuite/tests/typecheck/should_compile/all.T

@@ -454,3 +454,5 @@ test('T10335', normal, compile, [''])
 test('Improvement', normal, compile, [''])
 test('T10009', normal, compile, [''])
 test('T10390', normal, compile, [''])
+test('T8555', normal, compile, [''])
+test('T8799', normal, compile, [''])