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-rw-r--r--testsuite/tests/patsyn/should_fail/T18856.hs7
1 files changed, 7 insertions, 0 deletions
diff --git a/testsuite/tests/patsyn/should_fail/T18856.hs b/testsuite/tests/patsyn/should_fail/T18856.hs
new file mode 100644
index 0000000000..780a734d53
--- /dev/null
+++ b/testsuite/tests/patsyn/should_fail/T18856.hs
@@ -0,0 +1,7 @@
+{-# LANGUAGE PatternSynonyms, ViewPatterns #-}
+
+module T18856 where
+
+pattern P :: Int -> Bool -> (Int, Bool, [(Bool,Bool)])
+pattern P p q <- (q, p, [(True,False)])
+