{"ast_node_type":"function","tokens":[{"end":100,"kind":"keyword","start":0,"text":"fn"}]}
    fn spec_to_self_profile_string(&self, builder: &mut QueryKeyStringBuilder<'_, '_>) -> StringId {
impl SpecIntoSelfProfilingString for DefIndex {
        builder.def_id_to_string_id(DefId { krate: LOCAL_CRATE, index: *self })