Test Trac #12507wip/spj-tc-branch

This is now working apparently.  It relates to when a
polymorphic function gets instantiated, under some
implicit paramter bindings.

2 files changed, 17 insertions, 1 deletions

diff --git a/testsuite/tests/typecheck/should_compile/T12507.hs b/testsuite/tests/typecheck/should_compile/T12507.hs
new file mode 100644
index 0000000000..b4cfd0e082
--- /dev/null
+++ b/testsuite/tests/typecheck/should_compile/T12507.hs
@@ -0,0 +1,16 @@
+{-# LANGUAGE GADTs, ConstraintKinds, Rank2Types, ImplicitParams #-}
+
+module T12507 where
+
+data Rec fields where
+  Rec :: fields => Rec fields
+
+qn :: Rec fields -> (fields => r) -> r
+qn Rec e = e
+
+record :: Rec (?a :: Int, ?b :: String)
+record = Rec where ?a=42
+                   ?b="hey"
+
+access :: Int
+access = qn record ?a
diff --git a/testsuite/tests/typecheck/should_compile/all.T b/testsuite/tests/typecheck/should_compile/all.T
index 9f32b44d31..72c8ce93fa 100644
--- a/testsuite/tests/typecheck/should_compile/all.T
+++ b/testsuite/tests/typecheck/should_compile/all.T
@@ -535,4 +535,4 @@ test('T12381', normal, compile, [''])
 test('T12082', normal, compile, [''])
 test('T12427a', normal, compile_fail, [''])
 test('T12427b', normal, compile, [''])
-
+test('T12507', normal, compile, [''])