The Tor Browser / file revision

 // Breakpoints work in non-compile-and-go code. Bug 738479.

 var g = newGlobal();

 g.s = '';

 var dbg = new Debugger;

 var gw = dbg.addDebuggee(g);

 g.evaluate(

     "function f() {\n" +  // fscript.startLine

     "    s += 'a';\n" +   // fscript.startLine + 1

     "    s += 'b';\n" +   // fscript.startLine + 2

     "}\n",

     {compileAndGo: false});

 var fscript = gw.makeDebuggeeValue(g.f).script;

 var handler = {hit: function (frame) { g.s += '1'; }};

 for (var pc of fscript.getLineOffsets(fscript.startLine + 2))

     fscript.setBreakpoint(pc, handler);

 g.f();

 assertEq(g.s, "a1b");