syntax_data: {"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"debug!(\"coherence"}]}
source_snippet:             debug!("coherence stage: not knowable");
context_before:         if let Err(conflict) = self.is_knowable(stack) {
context_after:             if self.intercrate_ambiguity_causes.is_some() {