Add regression test for dodgy import warning bug

3 files changed, 17 insertions, 0 deletions

diff --git a/testsuite/tests/rename/should_compile/DodgyA.hs b/testsuite/tests/rename/should_compile/DodgyA.hs
new file mode 100644
index 0000000000..39cb3eca84
--- /dev/null
+++ b/testsuite/tests/rename/should_compile/DodgyA.hs
@@ -0,0 +1,9 @@
+{-# LANGUAGE TypeFamilies #-}
+
+module DodgyA(C(..), X(..)) where
+
+class C a where
+  data X a
+
+instance C Int where
+  data X Int = X1 Bool
diff --git a/testsuite/tests/rename/should_compile/all.T b/testsuite/tests/rename/should_compile/all.T
index 4ec6ea5f17..d0d2487621 100644
--- a/testsuite/tests/rename/should_compile/all.T
+++ b/testsuite/tests/rename/should_compile/all.T
@@ -196,3 +196,7 @@ test('T7085', normal, compile, [''])
 test('T7145a', normal, compile, ['-Wall -Werror'])
 test('T7145b', normal, compile, ['-Wall'])
 test('T6038', normal, compile, [''])
+test('dodgy',
+     [ extra_clean(['DodgyA.hi', 'DodgyA.o']) ],
+     multimod_compile,
+     ['dodgy', '-v0'])
diff --git a/testsuite/tests/rename/should_compile/dodgy.hs b/testsuite/tests/rename/should_compile/dodgy.hs
new file mode 100644
index 0000000000..ec18bbf8ec
--- /dev/null
+++ b/testsuite/tests/rename/should_compile/dodgy.hs
@@ -0,0 +1,4 @@
+{-# OPTIONS_GHC -fwarn-dodgy-imports #-}
+module Dodgy where
+
+import DodgyA (X(..))