Frame-this-07.js - mozsearch

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// Frame.this can be marked as optimized-out in some cases. Here we call an

// arrow function but its enclosing function is no longer live, so it's

// impossible to recover its missing 'this' binding.

var g = newGlobal({newCompartment: true});

g.eval("x = 4");

g.eval("var foo = function() { return () => 1; }; var arrow = foo.call(3);");

var dbg = new Debugger(g);

var log = "";

dbg.onEnterFrame = function (frame) {

    if (frame.type === "eval")

	return;

    assertEq(frame.type, "call");

    assertEq(frame.this.optimizedOut, true);

    frame.eval("try { print(this.x); } catch(e) { exc = e; }");

    assertEq(typeof g.exc, "object");

    log += "d";

};

g.eval("arrow();");

assertEq(log, "d");