From 70c8cf8db71880c1ab1f8fee4787a19316960dac Mon Sep 17 00:00:00 2001
From: janekptacijarabaci <janekptacijarabaci@seznam.cz>
Date: Sun, 25 Mar 2018 19:06:08 +0200
Subject: Bug 1360839 - Call IteratorClose due to abrupt completion from yield

Issue #74
---
 .../ecma_6/Generators/yield-iterator-close.js      | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 js/src/tests/ecma_6/Generators/yield-iterator-close.js

(limited to 'js/src/tests')

diff --git a/js/src/tests/ecma_6/Generators/yield-iterator-close.js b/js/src/tests/ecma_6/Generators/yield-iterator-close.js
new file mode 100644
index 000000000..970ad494d
--- /dev/null
+++ b/js/src/tests/ecma_6/Generators/yield-iterator-close.js
@@ -0,0 +1,58 @@
+// Test that IteratorClose is called when a Generator is abruptly completed by
+// Generator.return.
+
+var returnCalled = 0;
+function* wrapNoThrow() {
+  let iter = {
+    [Symbol.iterator]() {
+      return this;
+    },
+    next() {
+      return { value: 10, done: false };
+    },
+    return() {
+      returnCalled++;
+      return {};
+    }
+  };
+  for (const i of iter) {
+    yield i;
+  }
+}
+
+// Breaking calls Generator.return, which causes the yield above to resume with
+// an abrupt completion of kind "return", which then calls
+// iter.return.
+for (const i of wrapNoThrow()) {
+  break;
+}
+assertEq(returnCalled, 1);
+
+function* wrapThrow() {
+  let iter = {
+    [Symbol.iterator]() {
+      return this;
+    },
+    next() {
+      return { value: 10, done: false };
+    },
+    return() {
+      throw 42;
+    }
+  };
+  for (const i of iter) {
+    yield i;
+  }
+}
+
+// Breaking calls Generator.return, which, like above, calls iter.return. If
+// iter.return throws, since the yield is resuming with an abrupt completion of
+// kind "return", the newly thrown value takes precedence over returning.
+assertThrowsValue(() => {
+  for (const i of wrapThrow()) {
+    break;
+  }
+}, 42);
+
+if (typeof reportCompare === "function")
+  reportCompare(0, 0);
-- 
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