{"ast_node_type":"variable","tokens":[{"end":60,"kind":"keyword","start":0,"text":"if"}]}
                    if let hir::ExprKind::Lit(_) = expr.kind
                (&ty::Str, &ty::Array(arr, _) | &ty::Slice(arr)) if arr == self.tcx.types.u8 => {
                        && let Ok(src) = sm.span_to_snippet(sp)