1 files changed, 21 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/regress/regress-crbug-843022.js b/deps/v8/test/mjsunit/regress/regress-crbug-843022.js
new file mode 100644
index 0000000000..868054fa61
--- /dev/null
+++ b/deps/v8/test/mjsunit/regress/regress-crbug-843022.js
@@ -0,0 +1,21 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Produce an fast, but empty result.
+const fast_regexp_result = /./g.exec("a");
+fast_regexp_result.length = 0;
+class RegExpWithFastResult extends RegExp {
+  constructor() { super(".", "g"); this.number_of_runs = 0; }
+  exec(str) { return (this.number_of_runs++ == 0) ? fast_regexp_result : null; }
+}
+
+// A slow empty result.
+const slow_regexp_result = [];
+class RegExpWithSlowResult extends RegExp {
+  constructor() { super(".", "g"); this.number_of_runs = 0; }
+  exec(str) { return (this.number_of_runs++ == 0) ? slow_regexp_result : null; }
+}
+
+assertEquals(["undefined"], "a".match(new RegExpWithFastResult()));
+assertEquals(["undefined"], "a".match(new RegExpWithSlowResult()));