1 files changed, 21 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Environment-gc-03.js b/js/src/jit-test/tests/debug/Environment-gc-03.js
new file mode 100644
index 000000000..e3bbad052
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Environment-gc-03.js
@@ -0,0 +1,21 @@
+// Test that block scopes cannot be resurrected by onStep.
+
+var g = newGlobal();
+var dbg = new Debugger(g);
+dbg.onDebuggerStatement = function(frame) {
+    frame.onStep = (function() {
+        frame.environment;
+    });
+};
+
+g.eval("debugger; for (let i = 0; i < 1; i++) (function(){});");
+
+// If the last freshened block scope was incorrectly resurrected by onStep
+// above, GCing will assert.
+gc();
+
+g.eval("debugger; { let i = 0; (function(){ i = 42; }); }");
+gc();
+
+g.eval("debugger; try { throw 42; } catch (e) { };");
+gc();