syntax_data: {"ast_node_type":"other","tokens":[{"end":41,"kind":"keyword","start":0,"text":"(ast::LitKind::Err(guar),"}]}
source_snippet:         (ast::LitKind::Err(guar), _) => {
context_before:         (ast::LitKind::Char(c), ty::Char) => ConstValue::Scalar(Scalar::from_char(c)),
context_after:             return Const::Ty(Ty::new_error(tcx, guar), ty::Const::new_error(tcx, guar));