syntax_data: {"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"chain_refutabilities.iter().position(|r|"}]}
source_snippet:             chain_refutabilities.iter().position(|r| !matches!(*r, Some((_, Irrefutable))))
context_before:         if let Some(until) =
context_after:             && until > 0