1 files changed, 15 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_compile/tc105.hs b/testsuite/tests/typecheck/should_compile/tc105.hs
new file mode 100644
index 0000000000..6f35fff7fb
--- /dev/null
+++ b/testsuite/tests/typecheck/should_compile/tc105.hs
@@ -0,0 +1,15 @@
+{-# LANGUAGE Rank2Types, ScopedTypeVariables #-}
+
+module ShouldCompile where
+
+import Control.Monad.ST
+import Data.STRef
+
+-- (Modified now that we don't have result type signatures)
+
+f:: forall s. ST s Int
+f = do v <- newSTRef 5
+       let g :: ST s Int
+             -- ^ should be in scope
+           g = readSTRef v
+       g