{"ast_node_type":"other","tokens":[{"end":136,"kind":"keyword","start":0,"text":"FnOnce,"}]}
    FnOnce,                  sym::fn_once,             fn_once_trait,              Target::Trait,          GenericRequirement::Exact(1);
    FnMut,                   sym::fn_mut,              fn_mut_trait,               Target::Trait,          GenericRequirement::Exact(1);