syntax_data: {"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"ty::Coroutine(def_id,"}]}
source_snippet:                     ty::Coroutine(def_id, args) => {
context_before:                     // if they do.
context_after:                         // FIXME: See FIXME on `exhaustive` field above.