syntax_data: {"ast_node_type":"variable","tokens":[{"end":44,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let user_provided_type = match res {
context_before:         debug!("user_args_applied_to_res: res={:?}", res);
context_after:             // A reference to something callable -- e.g., a fn, method, or