Frame-onPop-generators-05.js

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// In .onPop for the "initial yield" of a generator, while the generator frame

// is on the stack, the generator object's .next() method throws.

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

g.eval(`

    function* f() {

        return "ok";

`);

let hits = 0;

let dbg = new Debugger;

let gw = dbg.addDebuggee(g);

dbg.onEnterFrame = frame => {

    dbg.onEnterFrame = undefined;  // Trigger only once.

    frame.onPop = completion => {

        // Initial yield.

        let genObj = completion.return;

        assertEq(genObj.class, "Generator");

        let result = frame.evalWithBindings("genObj.next()", {genObj});

        assertEq(result.throw.class, "TypeError");

        assertEq(result.throw.getProperty("message").return,

                 "already executing generator");

        hits++;

};

};

g.f();

assertEq(hits, 1);