@lezer/highlight parent.set is not iterable

[zealot09]

Describe the issue

macOS chrome 108.0.5359.98

maybe chrome upgrades and has special optimize for circular reference，below tag define will push itself into tag.set makes
circular reference。

    /// Define a new tag. If `parent` is given, the tag is treated as a
    /// sub-tag of that parent, and
    /// [highlighters](#highlight.tagHighlighter) that don't mention
    /// this tag will try to fall back to the parent tag (or grandparent
    /// tag, etc).
    static define(parent) {
        if (parent === null || parent === void 0 ? void 0 : parent.base)
            throw new Error("Can not derive from a modified tag");
        let tag = new Tag([], null, []);
        tag.set.push(tag);
        if (parent)
            for (let t of parent.set)
                tag.set.push(t);
        return tag;
    }

while debugging in chrome，strange things happened

then next line, init name with Tag.define, it turns out with Object[object] , not an instance of Tag

and go on, jserror

Browser and platform

macOS chrome 108.0.5359.98

Reproduction link

none

[marijnh]

Duplicate of lezer-parser/highlight#2