syntax_data: {"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"RtnModeHelper(RTN_MODE.with(|c|"}]}
source_snippet:         RtnModeHelper(RTN_MODE.with(|c| c.replace(mode)))
context_before:     pub fn with(mode: RtnMode) -> RtnModeHelper {
context_after:     }