error-cause-not-copied-when-redefined-to-accessor.js

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// Test that the ErrorCopier doesn't copy the optional "cause" property when it

// has been redefined to an accessor property.

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

var obj = g.eval(`

new Proxy({}, {

  isExtensible() {

    // Create an error object with an initial cause.

    let error = new Error("message", {cause: "initial cause"});

    // Ensure the "cause" property is correctly installed.

    assertEq(error.cause, "initial cause");

    // Redefine the "cause" data property to an accessor property.

    Object.defineProperty(error, "cause", { get() {} });

    // Throw the error.

    throw error;

});

`);

var dbg = new Debugger();

var gw = dbg.addDebuggee(g);

var objw = gw.makeDebuggeeValue(obj);

var err;

try {

  objw.isExtensible();

} catch (e) {

  err = e;

assertEq(err.cause, undefined);