syntax_data: {"ast_node_type":"other","tokens":[{"end":41,"kind":"keyword","start":0,"text":".collect::<Vec<_>>();"}]}
source_snippet:                     .collect::<Vec<_>>();
context_before:                     .map(|def_id| def_id.to_def_id())
context_after:                 Some((fn_def_id.to_def_id(), defs))