{"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"//"}]}
        // would force the closure to `FnOnce`.
        // uses its upvars (e.g. it consumes a non-copy value), but not *all* upvars
        // See the test: `async-await/async-closures/force-move-due-to-actually-fnonce.rs`.