{"ast_node_type":"function","tokens":[{"end":89,"kind":"keyword","start":0,"text":"fn"}]}
    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx rustc_hir::Expr<'tcx>) {
impl<'tcx> LateLintPass<'tcx> for SymbolInternStringLiteral {
        if let hir::ExprKind::Call(path, [arg]) = expr.kind