syntax_data: {"ast_node_type":"other","tokens":[{"end":29,"kind":"keyword","start":0,"text":".filter_map(|c|"}]}
source_snippet:             .filter_map(|c| {
context_before:             .iter()
context_after:                 if let TraitUpcastingUnsizeCandidate(i) = c.candidate { Some(i) } else { None }