syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"assert!(self.intercrate_ambiguity_causes.is_none());"}]}
source_snippet:         assert!(self.intercrate_ambiguity_causes.is_none());
context_before:         assert_matches!(self.infcx.typing_mode(), TypingMode::Coherence);
context_after:         self.intercrate_ambiguity_causes = Some(FxIndexSet::default());