syntax_data: {"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"field_names.filter_map(|n|"}]}
source_snippet:                         field_names.filter_map(|n| fields_map.get(&n).cloned()).collect()
context_before:                     AdtExprBase::None => {
context_after:                     }