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-rw-r--r--testsuite/tests/patsyn/should_fail/T16900.hs5
-rw-r--r--testsuite/tests/patsyn/should_fail/T16900.stderr8
-rw-r--r--testsuite/tests/patsyn/should_fail/all.T1
3 files changed, 14 insertions, 0 deletions
diff --git a/testsuite/tests/patsyn/should_fail/T16900.hs b/testsuite/tests/patsyn/should_fail/T16900.hs
new file mode 100644
index 0000000000..972c90530a
--- /dev/null
+++ b/testsuite/tests/patsyn/should_fail/T16900.hs
@@ -0,0 +1,5 @@
+{-# LANGUAGE PatternSynonyms #-}
+module T16900 where
+
+pattern P1 = P2
+pattern P2 = P1
diff --git a/testsuite/tests/patsyn/should_fail/T16900.stderr b/testsuite/tests/patsyn/should_fail/T16900.stderr
new file mode 100644
index 0000000000..2838c7f867
--- /dev/null
+++ b/testsuite/tests/patsyn/should_fail/T16900.stderr
@@ -0,0 +1,8 @@
+
+T16900.hs:4:1: error:
+ Recursive pattern synonym definition with following bindings:
+ P1 (defined at T16900.hs:4:1-15)
+ P2 (defined at T16900.hs:5:1-15)
+ |
+4 | pattern P1 = P2
+ | ^^^^^^^^^^^^^^^
diff --git a/testsuite/tests/patsyn/should_fail/all.T b/testsuite/tests/patsyn/should_fail/all.T
index 5431e8b76a..27ebc8bdd4 100644
--- a/testsuite/tests/patsyn/should_fail/all.T
+++ b/testsuite/tests/patsyn/should_fail/all.T
@@ -45,3 +45,4 @@ test('T15289', normal, compile_fail, [''])
test('T15685', normal, compile_fail, [''])
test('T15692', normal, compile, ['']) # It has -fdefer-type-errors inside
test('T15694', normal, compile_fail, [''])
+test('T16900', normal, compile_fail, ['-fdiagnostics-show-caret'])