src/third_party/mozjs-45/js/src/jit-test/tests/basic/function-tosource-getset.js

var o = {get prop() a + b, set prop(x) a + b};
var prop = Object.getOwnPropertyDescriptor(o, "prop");
assertEq(prop.get.toString(), "function () a + b");
assertEq(prop.get.toSource(), "(function () a + b)");
assertEq(prop.set.toString(), "function (x) a + b");
assertEq(prop.set.toSource(), "(function (x) a + b)");
assertEq(o.toSource(), "({get prop () a + b, set prop (x) a + b})");