[commit: ghc] ghc-8.0: Add tests for #11391 (59f58ea)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : ghc-8.0
Link       : http://ghc.haskell.org/trac/ghc/changeset/59f58ea540654f4a8d64bc881845ca9860ae2bf2/ghc

>---------------------------------------------------------------

commit 59f58ea540654f4a8d64bc881845ca9860ae2bf2
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Thu Jan 14 11:27:37 2016 +0100

    Add tests for #11391
    
    (cherry picked from commit f0c4e460ee0dad372d5b896a03cdac9666026174)


>---------------------------------------------------------------

59f58ea540654f4a8d64bc881845ca9860ae2bf2
 .../tests/typecheck/should_fail/CustomTypeErrors04.hs      | 14 ++++++++++++++
 .../tests/typecheck/should_fail/CustomTypeErrors04.stderr  |  5 +++++
 .../tests/typecheck/should_fail/CustomTypeErrors05.hs      | 14 ++++++++++++++
 .../tests/typecheck/should_fail/CustomTypeErrors05.stderr  |  5 +++++
 testsuite/tests/typecheck/should_fail/all.T                |  2 ++
 5 files changed, 40 insertions(+)

diff --git a/testsuite/tests/typecheck/should_fail/CustomTypeErrors04.hs b/testsuite/tests/typecheck/should_fail/CustomTypeErrors04.hs
new file mode 100644
index 0000000..d1957bf
--- /dev/null
+++ b/testsuite/tests/typecheck/should_fail/CustomTypeErrors04.hs
@@ -0,0 +1,14 @@
+{-# LANGUAGE TypeInType, TypeFamilies, UndecidableInstances #-}
+{-# LANGUAGE UndecidableInstances #-}
+
+-- The "bad case" in #11391
+module CustomTypeErrors04 where
+
+import Data.Kind
+import GHC.TypeLits (TypeError, ErrorMessage(..))
+
+type family Resolve (t :: Type -> Type) :: Type -> Type where
+  Resolve _ = TypeError (Text "ERROR")
+
+testNOTOK1 :: Resolve [] Int
+testNOTOK1 = ()
diff --git a/testsuite/tests/typecheck/should_fail/CustomTypeErrors04.stderr b/testsuite/tests/typecheck/should_fail/CustomTypeErrors04.stderr
new file mode 100644
index 0000000..9bec37b
--- /dev/null
+++ b/testsuite/tests/typecheck/should_fail/CustomTypeErrors04.stderr
@@ -0,0 +1,5 @@
+
+CustomTypeErrors04.hs:14:14: error:
+    • ERROR
+    • In the expression: ()
+      In an equation for ‘testNOTOK1’: testNOTOK1 = ()
diff --git a/testsuite/tests/typecheck/should_fail/CustomTypeErrors05.hs b/testsuite/tests/typecheck/should_fail/CustomTypeErrors05.hs
new file mode 100644
index 0000000..5a15b6f
--- /dev/null
+++ b/testsuite/tests/typecheck/should_fail/CustomTypeErrors05.hs
@@ -0,0 +1,14 @@
+{-# LANGUAGE TypeInType, TypeFamilies, UndecidableInstances #-}
+{-# LANGUAGE UndecidableInstances #-}
+
+-- The "tricky case" in #11391
+module CustomTypeErrors05 where
+
+import Data.Kind
+import GHC.TypeLits (TypeError, ErrorMessage(..))
+
+type family Resolve (t :: Type -> Type) :: Type -> Type where
+  Resolve _ = TypeError (Text "ERROR")
+
+testNOTOK2 :: Resolve [] Int
+testNOTOK2 = 1
diff --git a/testsuite/tests/typecheck/should_fail/CustomTypeErrors05.stderr b/testsuite/tests/typecheck/should_fail/CustomTypeErrors05.stderr
new file mode 100644
index 0000000..3164c86
--- /dev/null
+++ b/testsuite/tests/typecheck/should_fail/CustomTypeErrors05.stderr
@@ -0,0 +1,5 @@
+
+CustomTypeErrors05.hs:14:14: error:
+    • ERROR
+    • In the expression: 1
+      In an equation for ‘testNOTOK2’: testNOTOK2 = 1
diff --git a/testsuite/tests/typecheck/should_fail/all.T b/testsuite/tests/typecheck/should_fail/all.T
index 753708d..9aef820 100644
--- a/testsuite/tests/typecheck/should_fail/all.T
+++ b/testsuite/tests/typecheck/should_fail/all.T
@@ -394,6 +394,8 @@ test('T10971d', extra_clean(['T10971c.hi', 'T10971c.o']), multimod_compile_fail,
 test('CustomTypeErrors01', normal, compile_fail, [''])
 test('CustomTypeErrors02', normal, compile_fail, [''])
 test('CustomTypeErrors03', normal, compile_fail, [''])
+test('CustomTypeErrors04', normal, compile_fail, [''])
+test('CustomTypeErrors05', normal, compile_fail, [''])
 test('T11112', normal, compile_fail, [''])
 test('ClassOperator', normal, compile_fail, [''])
 test('T11274', normal, compile_fail, [''])