Bug test for GH-1370

tests/ecmascript/test-bug-incdec-stale-act-gh1370.js

@@ -0,0 +1,16 @@
+/*
+ *  Stale 'act' pointer in pre/post inc/dec handling.
+ *  https://github.com/svaarala/duktape/issues/1370
+ *
+
+/*===
+RangeError
+===*/
+
+try {
+    (function foo() {
+       foo--; foo();
+    })();
+} catch (e) {
+    print(e.name);  // eventual RangeError
+}