Function checkProto

scripts/libs/esprima.js:2484–2493

(key, computed, hasProto)

    }

    function checkProto(key, computed, hasProto) {
        if (computed === false && (key.type === Syntax.Identifier && key.name === '__proto__' ||
            key.type === Syntax.Literal && key.value === '__proto__')) {
            if (hasProto.value) {
                tolerateError(Messages.DuplicateProtoProperty);
            } else {
                hasProto.value = true;
            }
        }
    }

    function parseObjectProperty(hasProto) {
        var token = lookahead, node = new Node(), computed, key, maybeMethod, value;