{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"impl<'f,"}]}
impl<'f, 'sess: 'f, S: Stage> SharedContext<'f, 'sess, S> {
    pub(crate) fn emit_err(&self, diag: impl for<'x> Diagnostic<'x>) -> ErrorGuaranteed {