{"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"//"}]}
                    // FIXME(RalfJung) it makes little sense to not promote this in `fn`/`const fn`,
                    // FIXME(eddyb) does this matter at all for promotion?
                    // and in `const` this cannot occur anyway. The only concern is that we might