src/third_party/mozjs-45/js/src/jit-test/tests/debug/Frame-eval-05.js

// var declarations in strict frame.eval do not modify the frame

var g = newGlobal();
var dbg = new Debugger(g);
var cv;
dbg.onDebuggerStatement = function (frame) {
    cv = frame.eval("'use strict'; var a = 2; h();");
};
g.a = 1;
g.eval("function f(s) { function h() { return a; } eval(s); debugger; } ");
g.eval("f('0');");
assertEq(cv.return, 1);
g.eval("f('var a = 3;');");
assertEq(cv.return, 3);