{"ast_node_type":"variable","tokens":[{"end":43,"kind":"keyword","start":0,"text":"if"}]}
    if let ast::Expr::MacroExpr(_) = expr {
fn expr_require_exclusive_access(ctx: &AssistContext<'_>, expr: &ast::Expr) -> Option<bool> {
        // FIXME: expand macro and check output for mutable usages of the variable?