1 files changed, 59 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/prototype/Symbol.matchAll/isregexp-called-once.js b/js/src/tests/test262/built-ins/RegExp/prototype/Symbol.matchAll/isregexp-called-once.js
new file mode 100644
index 0000000000..4d0888f201
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/prototype/Symbol.matchAll/isregexp-called-once.js
@@ -0,0 +1,59 @@
+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: IsRegExp should only be called once
+info: |
+  RegExp.prototype [ @@matchAll ] ( string )
+    1. Let R be the this value.
+    [...]
+    4. Let C be ? SpeciesConstructor(R, %RegExp%).
+    5. Let flags be ? ToString(? Get(R, "flags")).
+    6. Let matcher be ? Construct(C, « R, flags »).
+
+  21.2.3.1 RegExp ( pattern, flags )
+    1. Let patternIsRegExp be ? IsRegExp(pattern).
+    [...]
+features: [Symbol.match, Symbol.matchAll]
+---*/
+
+var internalCount = 0;
+Object.defineProperty(RegExp.prototype, Symbol.match, {
+  get: function() {
+    ++internalCount;
+    return true;
+  }
+});
+
+var calls = [];
+var o = {
+  get [Symbol.match]() {
+    calls.push('get @@match');
+    return false;
+  },
+  get flags() {
+    calls.push('get flags');
+    return {
+      toString() {
+        calls.push('flags toString');
+        return "";
+      }
+    };
+  },
+};
+
+RegExp.prototype[Symbol.matchAll].call(o, {
+  toString() {
+    calls.push('arg toString')
+  }
+});
+
+assert.sameValue(0, internalCount);
+
+assert.sameValue(calls.length, 4);
+assert.sameValue(calls[0], 'arg toString');
+assert.sameValue(calls[1], 'get flags');
+assert.sameValue(calls[2], 'flags toString');
+assert.sameValue(calls[3], 'get @@match');
+
+reportCompare(0, 0);