syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"Err(SelectionError::Overflow(OverflowError::Canonical))"}]}
source_snippet:                 Err(SelectionError::Overflow(OverflowError::Canonical))
context_before:                 assert!(self.query_mode == TraitQueryMode::Canonical);
context_after:             }