| // RUN: %clang_cc1 -std=c++20 -Wno-unused-value -fsyntax-only -verify %s | 
 |  | 
 | namespace GH49266 { | 
 | struct X { | 
 |   X() = default; | 
 |   X(X const&) = delete; // expected-note {{'X' has been explicitly marked deleted here}} | 
 | }; | 
 |  | 
 | void take_by_copy(auto &...args) { | 
 |   [...args = args] {}(); // expected-error {{call to deleted constructor}} | 
 | } | 
 |  | 
 | void take_by_ref(auto &...args) { | 
 |   [&...args = args] {}(); // args is passed by reference and not copied. | 
 | } | 
 |  | 
 | void foo() { | 
 |   X x; | 
 |   take_by_copy(x); // expected-note {{in instantiation of function template specialization}} | 
 |   take_by_ref(x); | 
 | } | 
 | } |