1 // RUN: %clang_cc1 %s -fsyntax-only -verify -std=c++20
2
foo()3 void foo() {
4 void fn(int i, int = ({ 1; })); // expected-error {{default argument may not use a GNU statement expression}}
5
6 auto a = [](int = ({ 1; })) {}; // expected-error {{default argument may not use a GNU statement expression}}
7
8 auto b = []<int = ({ 1; })>(){}; // expected-error {{default non-type template argument may not use a GNU statement expression}}
9
10 void fn(int i, int j = ({{}, {}, {,}}), int k = ""); // expected-error {{default argument may not use a GNU statement expression}} expected-error {{cannot initialize a parameter of type 'int' with an lvalue of type 'const char[1]'}} expected-note {{passing argument to parameter 'k' here}}
11 }
12
13 template <int foo = ({ 1; })> // expected-error {{default non-type template argument may not use a GNU statement expression}}
f()14 void f() {}
15
16 template <int bar = ({ 1; })> // expected-error {{default non-type template argument may not use a GNU statement expression}}
17 class S {};
18
19 template <typename Callable>
bar(Callable && Call)20 int bar(Callable &&Call) {
21 return Call();
22 }
23
baz()24 int baz() {
25 auto l = [](int a = ({ int x = 12; x; })) { // expected-error {{default argument may not use a GNU statement expression}}
26 return 1;
27 };
28 return bar(l);
29 }
30