syntax_data: {"ast_node_type":"other","tokens":[{"end":18,"kind":"keyword","start":0,"text":"};"}]}
source_snippet:                 };
context_before:                     return Some((fn_def_id.to_def_id(), vec![]));
context_after:                 let def_name = tcx.item_name(fn_def_id.to_def_id());