{"ast_node_type":"variable","tokens":[{"end":41,"kind":"keyword","start":0,"text":"let"}]}
        let impl_indent = old_indent + 1;
    if let Some(self_ty) = parent_impl.as_ref().and_then(|imp| imp.self_ty()) {
        body = format!("{impl_indent}impl {self_ty} {{\n{body}\n{impl_indent}}}");