{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"self.dcx().emit_err(errors::UnsafeNegativeImpl"}]}
                    self.dcx().emit_err(errors::UnsafeNegativeImpl {
                if let (&Safety::Unsafe(span), &ImplPolarity::Negative(sp)) = (safety, polarity) {
                        span: sp.to(t.path.span),