Add m-esr52 at 52.6.0

1 files changed, 32 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/basic/bug786114.js b/js/src/jit-test/tests/basic/bug786114.js
new file mode 100644
index 000000000..718d0426c
--- /dev/null
+++ b/js/src/jit-test/tests/basic/bug786114.js
@@ -0,0 +1,32 @@
+let expected = 'o!o!o!';
+let actual = '';
+
+// g is a function that needs an implicit |this| if called within a |with|
+// statement.  If we fail to provide that implicit |this|, it will append
+// "[object global]" instead of "o!".
+let o = {
+  g: function() { actual += this.toString(); },
+  toString: function() { return "o!"; }
+}
+
+// g's presence within the |with| is detected by simple tracking of |with|s
+// during parsing.
+with (o) {
+  (function() { g(); })();
+}
+
+// The eval() defeats the tracking of |with| during parsing.  Instead, g's
+// presence within the |with| is detected by looking at the scopeChain of the
+// ParseContext.
+with (o) {
+  eval("(function() { g(); })()");
+}
+
+// This is like the above case, but the knowledge of the |with| presence must
+// be inherited by the inner function.  This is the case that was missed in bug
+// 786114.
+with (o) {
+  eval("(function() { (function() { g(); })(); })()");
+}
+
+assertEq(actual, expected);