{"ast_node_type":"function","tokens":[{"end":68,"kind":"keyword","start":0,"text":"fn"}]}
                fn fn_other() fn() -> Option<u32> [type_could_unify]
                fn fn_ctr_wrapped_2() fn() -> Result<Foo<T>, u32> [type_could_unify]
                me fn_returns_unit(…) fn(&self) [type_could_unify]