syntax_data: {"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"(Ok(src),"}]}
source_snippet:                 (Ok(src), Ok(dst)) => MaybeTransmutableQuery { src, dst, assume, context }.answer(),
context_before:                 (_, Err(Err::SizeOverflow)) => Answer::No(Reason::DstSizeOverflow),
context_after:             }