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diff --git a/testsuite/tests/th/T3100.hs b/testsuite/tests/th/T3100.hs
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+++ b/testsuite/tests/th/T3100.hs
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+{-# LANGUAGE RankNTypes, FlexibleContexts, ImplicitParams, TemplateHaskell #-}
+
+-- This test makes sure TH understands types where
+-- there is a predicate but no 'forall'
+--
+-- There are two tests in here; both should be fine
+-- Trac ticket: #3100
+
+module T3100 where
+
+import Language.Haskell.TH
+
+flop :: Ord Int => Int -> Int
+flop x = x
+
+$(do { t <- reify 'flop; return [] })
+
+type T a = Eq a => a
+
+$(do { reify ''T; return []})