syntax_data: {"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"debug!(?src_state,"}]}
source_snippet:         debug!(?src_state, ?dst_state);
context_before:     ) -> Answer<<C as QueryContext>::Region, <C as QueryContext>::Type> {
context_after:         debug!(src = ?self.src);