syntax_data: {"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":".flat_map(|trait_ref|"}]}
source_snippet:             .flat_map(|trait_ref| trait_ref.path.segments.last().unwrap().args().args)
context_before:             .into_iter()
context_after:             .map(|arg| arg.span());