syntax_data: {"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"(_,"}]}
source_snippet:                 (_, Err(Err::SizeOverflow)) => Answer::No(Reason::DstSizeOverflow),
context_before:                 (Err(Err::SizeOverflow), _) => Answer::No(Reason::SrcSizeOverflow),
context_after:                 (Ok(src), Ok(dst)) => MaybeTransmutableQuery { src, dst, assume, context }.answer(),