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diff --git a/ghc/compiler/tests/typecheck/should_succeed/tc040.hs b/ghc/compiler/tests/typecheck/should_succeed/tc040.hs
new file mode 100644
index 0000000..33113cc
--- /dev/null
+++ b/ghc/compiler/tests/typecheck/should_succeed/tc040.hs
@@ -0,0 +1,9 @@
+module ShouldSucceed where
+
+--!!! tests the deduction of contexts.
+
+f :: (Eq a) => a -> [a]
+
+f x = g x
+      where
+      g y = if (y == x) then [] else [y]