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llvm-project/clang/test/SemaCXX/cxx1y-generic-lambdas.cpp

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// RUN: %clang_cc1 -std=c++1y -verify -fsyntax-only -fblocks -emit-llvm-only %s
// RUN: %clang_cc1 -std=c++1y -verify -fsyntax-only -fblocks -fdelayed-template-parsing %s -DDELAYED_TEMPLATE_PARSING
// RUN: %clang_cc1 -std=c++1y -verify -fsyntax-only -fblocks -fms-extensions %s -DMS_EXTENSIONS
// RUN: %clang_cc1 -std=c++1y -verify -fsyntax-only -fblocks -fdelayed-template-parsing -fms-extensions %s -DMS_EXTENSIONS -DDELAYED_TEMPLATE_PARSING
template<class F, class ...Rest> struct first_impl { typedef F type; };
template<class ...Args> using first = typename first_impl<Args...>::type;
namespace simple_explicit_capture {
void test() {
int i;
auto L = [i](auto a) { return i + a; };
L(3.14);
}
}
namespace explicit_call {
int test() {
auto L = [](auto a) { return a; };
L.operator()(3);
L.operator()<char>(3.14); //expected-warning{{implicit conversion}}
return 0;
}
} //end ns
namespace test_conversion_to_fptr_2 {
template<class T> struct X {
T (*fp)(T) = [](auto a) { return a; };
};
X<int> xi;
template<class T>
void fooT(T t, T (*fp)(T) = [](auto a) { return a; }) {
fp(t);
}
int test() {
{
auto L = [](auto a) { return a; };
int (*fp)(int) = L;
fp(5);
L(3);
char (*fc)(char) = L;
fc('b');
L('c');
double (*fd)(double) = L;
fd(3.14);
fd(6.26);
L(4.25);
}
{
auto L = [](auto a) ->int { return a; }; //expected-note 2{{candidate template ignored}}
int (*fp)(int) = L;
char (*fc)(char) = L; //expected-error{{no viable conversion}}
double (*fd)(double) = L; //expected-error{{no viable conversion}}
}
{
int x = 5;
auto L = [=](auto b, char c = 'x') {
int i = x;
return [](auto a) ->decltype(a) { return a; };
};
int (*fp)(int) = L(8);
fp(5);
L(3);
char (*fc)(char) = L('a');
fc('b');
L('c');
double (*fd)(double) = L(3.14);
fd(3.14);
fd(6.26);
}
{
auto L = [=](auto b) {
return [](auto a) ->decltype(b)* { return (decltype(b)*)0; };
};
int* (*fp)(int) = L(8);
fp(5);
L(3);
char* (*fc)(char) = L('a');
fc('b');
L('c');
double* (*fd)(double) = L(3.14);
fd(3.14);
fd(6.26);
}
{
auto L = [=](auto b) {
return [](auto a) ->decltype(b)* { return (decltype(b)*)0; }; //expected-note{{candidate template ignored}}
};
char* (*fp)(int) = L('8');
fp(5);
char* (*fc)(char) = L('a');
fc('b');
double* (*fi)(int) = L(3.14);
fi(5);
int* (*fi2)(int) = L(3.14); //expected-error{{no viable conversion}}
}
{
auto L = [=](auto b) {
return [](auto a) {
return [=](auto c) {
return [](auto d) ->decltype(a + b + c + d) { return d; };
};
};
};
int (*fp)(int) = L('8')(3)(short{});
double (*fs)(char) = L(3.14)(short{})('4');
}
fooT(3);
fooT('a');
fooT(3.14);
fooT("abcdefg");
return 0;
}
int run2 = test();
}
namespace test_conversion_to_fptr {
void f1(int (*)(int)) { }
void f2(char (*)(int)) { } // expected-note{{candidate}}
void g(int (*)(int)) { } // #1 expected-note{{candidate}}
void g(char (*)(char)) { } // #2 expected-note{{candidate}}
void h(int (*)(int)) { } // #3
void h(char (*)(int)) { } // #4
int test() {
{
auto glambda = [](auto a) { return a; };
glambda(1);
f1(glambda); // OK
f2(glambda); // expected-error{{no matching function}}
g(glambda); // expected-error{{call to 'g' is ambiguous}}
h(glambda); // OK: calls #3 since it is convertible from ID
int& (*fpi)(int*) = [](auto* a) -> auto& { return *a; }; // OK
}
{
auto L = [](auto a) { return a; };
int (*fp)(int) = L;
fp(5);
L(3);
char (*fc)(char) = L;
fc('b');
L('c');
double (*fd)(double) = L;
fd(3.14);
fd(6.26);
L(4.25);
}
{
auto L = [](auto a) ->int { return a; }; //expected-note 2{{candidate template ignored}}
int (*fp)(int) = L;
char (*fc)(char) = L; //expected-error{{no viable conversion}}
double (*fd)(double) = L; //expected-error{{no viable conversion}}
}
{
int* (*fp)(int*) = [](auto *a) -> auto* { return a; };
fp(0);
}
}
namespace more_converion_to_ptr_to_function_tests {
int test() {
{
int& (*fpi)(int*) = [](auto* a) -> auto& { return *a; }; // OK
int (*fp2)(int) = [](auto b) -> int { return b; };
int (*fp3)(char) = [](auto c) -> int { return c; };
char (*fp4)(int) = [](auto d) { return d; }; //expected-error{{no viable conversion}}\
//expected-note{{candidate template ignored}}
char (*fp5)(char) = [](auto e) -> int { return e; }; //expected-error{{no viable conversion}}\
//expected-note{{candidate template ignored}}
fp2(3);
fp3('\n');
fp3('a');
return 0;
}
} // end test()
template<class ... Ts> void vfun(Ts ... ) { }
int variadic_test() {
int (*fp)(int, char, double) = [](auto ... a) -> int { vfun(a...); return 4; };
fp(3, '4', 3.14);
int (*fp2)(int, char, double) = [](auto ... a) { vfun(a...); return 4; };
fp(3, '4', 3.14);
return 2;
}
} // end ns
namespace conversion_operator {
void test() {
auto L = [](auto a) -> int { return a; };
int (*fp)(int) = L;
int (&fp2)(int) = [](auto a) { return a; }; // expected-error{{non-const lvalue}}
int (&&fp3)(int) = [](auto a) { return a; }; // expected-error{{no viable conversion}}\
//expected-note{{candidate}}
}
}
}
namespace return_type_deduction_ok {
auto l = [](auto a) ->auto { return a; }(2);
auto l2 = [](auto a) ->decltype(auto) { return a; }(2);
auto l3 = [](auto a) { return a; }(2);
}
namespace generic_lambda_as_default_argument_ok {
void test(int i = [](auto a)->int { return a; }(3)) {
}
}
namespace nested_non_capturing_lambda_tests {
template<class ... Ts> void print(Ts ...) { }
int test() {
{
auto L = [](auto a) {
return [](auto b) {
return b;
};
};
auto M = L(3);
M(4.15);
}
{
int i = 10; //expected-note 3{{declared here}}
auto L = [](auto a) {
return [](auto b) { //expected-note 3{{begins here}}
i = b; //expected-error 3{{cannot be implicitly captured}}
return b;
};
};
auto M = L(3); //expected-note{{instantiation}}
M(4.15); //expected-note{{instantiation}}
}
{
int i = 10;
auto L = [](auto a) {
return [](auto b) {
b = sizeof(i); //ok
return b;
};
};
}
{
auto L = [](auto a) {
print("a = ", a, "\n");
return [](auto b) ->decltype(a) {
print("b = ", b, "\n");
return b;
};
};
auto M = L(3);
M(4.15);
}
{
auto L = [](auto a) ->decltype(a) {
print("a = ", a, "\n");
return [](auto b) ->decltype(a) { //expected-error{{no viable conversion}}\
//expected-note{{candidate template ignored}}
print("b = ", b, "\n");
return b;
};
};
auto M = L(3); //expected-note{{in instantiation of}}
}
{
auto L = [](auto a) {
print("a = ", a, "\n");
return [](auto ... b) ->decltype(a) {
print("b = ", b ..., "\n");
return 4;
};
};
auto M = L(3);
M(4.15, 3, "fv");
}
{
auto L = [](auto a) {
print("a = ", a, "\n");
return [](auto ... b) ->decltype(a) {
print("b = ", b ..., "\n");
return 4;
};
};
auto M = L(3);
int (*fp)(double, int, const char*) = M;
fp(4.15, 3, "fv");
}
{
auto L = [](auto a) {
print("a = ", a, "\n");
return [](char b) {
return [](auto ... c) ->decltype(b) {
print("c = ", c ..., "\n");
return 42;
};
};
};
L(4);
auto M = L(3);
M('a');
auto N = M('x');
N("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
char (*np)(const char*, int, const char*, double, const char*, int) = N;
np("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
}
{
auto L = [](auto a) {
print("a = ", a, "\n");
return [](decltype(a) b) {
return [](auto ... c) ->decltype(b) {
print("c = ", c ..., "\n");
return 42;
};
};
};
L('4');
auto M = L('3');
M('a');
auto N = M('x');
N("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
char (*np)(const char*, int, const char*, double, const char*, int) = N;
np("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
}
{
struct X {
static void foo(double d) { }
void test() {
auto L = [](auto a) {
print("a = ", a, "\n");
foo(a);
return [](decltype(a) b) {
foo(b);
foo(sizeof(a) + sizeof(b));
return [](auto ... c) ->decltype(b) {
print("c = ", c ..., "\n");
foo(decltype(b){});
foo(sizeof(decltype(a)*) + sizeof(decltype(b)*));
return 42;
};
};
};
L('4');
auto M = L('3');
M('a');
auto N = M('x');
N("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
char (*np)(const char*, int, const char*, double, const char*, int) = N;
np("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
}
};
X x;
x.test();
}
// Make sure we can escape the function
{
struct X {
static void foo(double d) { }
auto test() {
auto L = [](auto a) {
print("a = ", a, "\n");
foo(a);
return [](decltype(a) b) {
foo(b);
foo(sizeof(a) + sizeof(b));
return [](auto ... c) ->decltype(b) {
print("c = ", c ..., "\n");
foo(decltype(b){});
foo(sizeof(decltype(a)*) + sizeof(decltype(b)*));
return 42;
};
};
};
return L;
}
};
X x;
auto L = x.test();
L('4');
auto M = L('3');
M('a');
auto N = M('x');
N("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
char (*np)(const char*, int, const char*, double, const char*, int) = N;
np("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
}
{
struct X {
static void foo(double d) { }
auto test() {
auto L = [](auto a) {
print("a = ", a, "\n");
foo(a);
return [](decltype(a) b) {
foo(b);
foo(sizeof(a) + sizeof(b));
return [](auto ... c) {
print("c = ", c ..., "\n");
foo(decltype(b){});
foo(sizeof(decltype(a)*) + sizeof(decltype(b)*));
return [](decltype(c) ... d) ->decltype(a) { //expected-note{{candidate}}
print("d = ", d ..., "\n");
foo(decltype(b){});
foo(sizeof(decltype(a)*) + sizeof(decltype(b)*));
return decltype(a){};
};
};
};
};
return L;
}
};
X x;
auto L = x.test();
L('4');
auto M = L('3');
M('a');
auto N = M('x');
auto O = N("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
char (*np)(const char*, int, const char*, double, const char*, int) = O;
np("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
int (*np2)(const char*, int, const char*, double, const char*, int) = O; // expected-error{{no viable conversion}}
}
} // end test()
namespace wrapped_within_templates {
namespace explicit_return {
template<class T> int fooT(T t) {
auto L = [](auto a) -> void {
auto M = [](char b) -> void {
auto N = [](auto c) -> void {
int x = 0;
x = sizeof(a);
x = sizeof(b);
x = sizeof(c);
};
N('a');
N(decltype(a){});
};
};
L(t);
L(3.14);
return 0;
}
int run = fooT('a') + fooT(3.14);
} // end explicit_return
namespace implicit_return_deduction {
template<class T> auto fooT(T t) {
auto L = [](auto a) {
auto M = [](char b) {
auto N = [](auto c) {
int x = 0;
x = sizeof(a);
x = sizeof(b);
x = sizeof(c);
};
N('a');
N(decltype(a){});
};
};
L(t);
L(3.14);
return 0;
}
int run = fooT('a') + fooT(3.14);
template<class ... Ts> void print(Ts ... ts) { }
template<class ... Ts> auto fooV(Ts ... ts) {
auto L = [](auto ... a) {
auto M = [](decltype(a) ... b) {
auto N = [](auto c) {
int x = 0;
x = sizeof...(a);
x = sizeof...(b);
x = sizeof(c);
};
N('a');
N(N);
N(first<Ts...>{});
};
M(a...);
print("a = ", a..., "\n");
};
L(L, ts...);
print("ts = ", ts..., "\n");
return 0;
}
int run2 = fooV(3.14, " ", '4', 5) + fooV("BC", 3, 2.77, 'A', float{}, short{}, unsigned{});
} //implicit_return_deduction
} //wrapped_within_templates
namespace at_ns_scope {
void foo(double d) { }
auto test() {
auto L = [](auto a) {
print("a = ", a, "\n");
foo(a);
return [](decltype(a) b) {
foo(b);
foo(sizeof(a) + sizeof(b));
return [](auto ... c) {
print("c = ", c ..., "\n");
foo(decltype(b){});
foo(sizeof(decltype(a)*) + sizeof(decltype(b)*));
return [](decltype(c) ... d) ->decltype(a) { //expected-note{{candidate}}
print("d = ", d ..., "\n");
foo(decltype(b){});
foo(sizeof(decltype(a)*) + sizeof(decltype(b)*));
return decltype(a){};
};
};
};
};
return L;
}
auto L = test();
auto L_test = L('4');
auto M = L('3');
auto M_test = M('a');
auto N = M('x');
auto O = N("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
char (*np)(const char*, int, const char*, double, const char*, int) = O;
auto NP_result = np("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
int (*np2)(const char*, int, const char*, double, const char*, int) = O; // expected-error{{no viable conversion}}
}
namespace variadic_tests_1 {
template<class ... Ts> void print(Ts ... ts) { }
template<class F, class ... Rest> F& FirstArg(F& f, Rest...) { return f; }
template<class ... Ts> int fooV(Ts ... ts) {
auto L = [](auto ... a) -> void {
auto M = [](decltype(a) ... b) -> void {
auto N = [](auto c) -> void {
int x = 0;
x = sizeof...(a);
x = sizeof...(b);
x = sizeof(c);
};
N('a');
N(N);
N(first<Ts...>{});
};
M(a...);
print("a = ", a..., "\n");
};
L(L, ts...);
print("ts = ", ts..., "\n");
return 0;
}
int run2 = fooV(3.14, " ", '4', 5) + fooV("BC", 3, 2.77, 'A', float{}, short{}, unsigned{});
namespace more_variadic_1 {
template<class ... Ts> int fooV(Ts ... ts) {
auto L = [](auto ... a) {
auto M = [](decltype(a) ... b) -> void {
auto N = [](auto c) -> void {
int x = 0;
x = sizeof...(a);
x = sizeof...(b);
x = sizeof(c);
};
N('a');
N(N);
N(first<Ts...>{});
};
M(a...);
return M;
};
auto M = L(L, ts...);
decltype(L(L, ts...)) (*fp)(decltype(L), decltype(ts) ...) = L;
void (*fp2)(decltype(L), decltype(ts) ...) = L(L, ts...);
{
auto L = [](auto ... a) {
auto M = [](decltype(a) ... b) {
auto N = [](auto c) -> void {
int x = 0;
x = sizeof...(a);
x = sizeof...(b);
x = sizeof(c);
};
N('a');
N(N);
N(first<Ts...>{});
return N;
};
M(a...);
return M;
};
auto M = L(L, ts...);
decltype(L(L, ts...)) (*fp)(decltype(L), decltype(ts) ...) = L;
fp(L, ts...);
decltype(L(L, ts...)(L, ts...)) (*fp2)(decltype(L), decltype(ts) ...) = L(L, ts...);
fp2 = fp(L, ts...);
void (*fp3)(char) = fp2(L, ts...);
fp3('a');
}
return 0;
}
int run2 = fooV(3.14, " ", '4', 5) + fooV("BC", 3, 2.77, 'A', float{}, short{}, unsigned{});
} //end ns more_variadic_1
} // end ns variadic_tests_1
namespace at_ns_scope_within_class_member {
struct X {
static void foo(double d) { }
auto test() {
auto L = [](auto a) {
print("a = ", a, "\n");
foo(a);
return [](decltype(a) b) {
foo(b);
foo(sizeof(a) + sizeof(b));
return [](auto ... c) {
print("c = ", c ..., "\n");
foo(decltype(b){});
foo(sizeof(decltype(a)*) + sizeof(decltype(b)*));
return [](decltype(c) ... d) ->decltype(a) { //expected-note{{candidate}}
print("d = ", d ..., "\n");
foo(decltype(b){});
foo(sizeof(decltype(a)*) + sizeof(decltype(b)*));
return decltype(a){};
};
};
};
};
return L;
}
};
X x;
auto L = x.test();
auto L_test = L('4');
auto M = L('3');
auto M_test = M('a');
auto N = M('x');
auto O = N("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
char (*np)(const char*, int, const char*, double, const char*, int) = O;
auto NP_result = np("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
int (*np2)(const char*, int, const char*, double, const char*, int) = O; // expected-error{{no viable conversion}}
} //end at_ns_scope_within_class_member
namespace at_ns_scope_within_class_template_member {
struct X {
static void foo(double d) { }
template<class T = int>
auto test(T = T{}) {
auto L = [](auto a) {
print("a = ", a, "\n");
foo(a);
return [](decltype(a) b) {
foo(b);
foo(sizeof(a) + sizeof(b));
return [](auto ... c) {
print("c = ", c ..., "\n");
foo(decltype(b){});
foo(sizeof(decltype(a)*) + sizeof(decltype(b)*));
return [](decltype(c) ... d) ->decltype(a) { //expected-note{{candidate}}
print("d = ", d ..., "\n");
foo(decltype(b){});
foo(sizeof(decltype(a)*) + sizeof(decltype(b)*));
return decltype(a){};
};
};
};
};
return L;
}
};
X x;
auto L = x.test();
auto L_test = L('4');
auto M = L('3');
auto M_test = M('a');
auto N = M('x');
auto O = N("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
char (*np)(const char*, int, const char*, double, const char*, int) = O;
auto NP_result = np("\n3 = ", 3, "\n6.14 = ", 6.14, "\n4'123'456 = ", 4'123'456);
int (*np2)(const char*, int, const char*, double, const char*, int) = O; // expected-error{{no viable conversion}}
} //end at_ns_scope_within_class_member
namespace nested_generic_lambdas_123 {
void test() {
auto L = [](auto a) -> int {
auto M = [](auto b, decltype(a) b2) -> int {
return 1;
};
M(a, a);
};
L(3);
}
template<class T> void foo(T) {
auto L = [](auto a) { return a; };
}
template void foo(int);
} // end ns nested_generic_lambdas_123
namespace nested_fptr_235 {
int test()
{
auto L = [](auto b) {
return [](auto a) ->decltype(a) { return a; };
};
int (*fp)(int) = L(8);
fp(5);
L(3);
char (*fc)(char) = L('a');
fc('b');
L('c');
double (*fd)(double) = L(3.14);
fd(3.14);
fd(6.26);
return 0;
}
int run = test();
}
namespace fptr_with_decltype_return_type {
template<class F, class ... Rest> F& FirstArg(F& f, Rest& ... r) { return f; };
template<class ... Ts> auto vfun(Ts&& ... ts) {
print(ts...);
return FirstArg(ts...);
}
int test()
{
{
auto L = [](auto ... As) {
return [](auto b) ->decltype(b) {
vfun([](decltype(As) a) -> decltype(a) { return a; } ...)(first<decltype(As)...>{});
return decltype(b){};
};
};
auto LL = L(1, 'a', 3.14, "abc");
LL("dim");
}
return 0;
}
int run = test();
}
} // end ns nested_non_capturing_lambda_tests
namespace PR17476 {
struct string {
string(const char *__s) { }
string &operator+=(const string &__str) { return *this; }
};
template <class T>
void finalizeDefaultAtomValues() {
auto startEnd = [](const char * sym) -> void {
string start("__");
start += sym;
};
startEnd("preinit_array");
}
void f() { finalizeDefaultAtomValues<char>(); }
}
namespace PR17476_variant {
struct string {
string(const char *__s) { }
string &operator+=(const string &__str) { return *this; }
};
template <class T>
void finalizeDefaultAtomValues() {
auto startEnd = [](const T *sym) -> void {
string start("__");
start += sym;
};
startEnd("preinit_array");
}
void f() { finalizeDefaultAtomValues<char>(); }
}
namespace PR17877_lambda_declcontext_and_get_cur_lambda_disconnect {
template<class T> struct U {
int t = 0;
};
template<class T>
struct V {
U<T> size() const { return U<T>{}; }
};
template<typename T>
void Do() {
V<int> v{};
[=] { v.size(); };
}
}
namespace inclass_lambdas_within_nested_classes {
namespace ns1 {
struct X1 {
struct X2 {
enum { E = [](auto i) { return i; }(3) }; //expected-error{{inside of a constant expression}}\
//expected-error{{not an integral constant}}\
//expected-note{{non-literal type}}
int L = ([] (int i) { return i; })(2);
void foo(int i = ([] (int i) { return i; })(2)) { }
int B : ([](int i) { return i; })(3); //expected-error{{inside of a constant expression}}\
//expected-error{{not an integral constant}}\
//expected-note{{non-literal type}}
int arr[([](int i) { return i; })(3)]; //expected-error{{inside of a constant expression}}\
//expected-error{{must have a constant size}}
int (*fp)(int) = [](int i) { return i; };
void fooptr(int (*fp)(char) = [](char c) { return 0; }) { }
int L2 = ([](auto i) { return i; })(2);
void fooG(int i = ([] (auto i) { return i; })(2)) { }
int BG : ([](auto i) { return i; })(3); //expected-error{{inside of a constant expression}} \
//expected-error{{not an integral constant}}\
//expected-note{{non-literal type}}
int arrG[([](auto i) { return i; })(3)]; //expected-error{{inside of a constant expression}}\
//expected-error{{must have a constant size}}
int (*fpG)(int) = [](auto i) { return i; };
void fooptrG(int (*fp)(char) = [](auto c) { return 0; }) { }
};
};
} //end ns
namespace ns2 {
struct X1 {
template<class T>
struct X2 {
int L = ([] (T i) { return i; })(2);
void foo(int i = ([] (int i) { return i; })(2)) { }
int B : ([](T i) { return i; })(3); //expected-error{{inside of a constant expression}}\
//expected-error{{not an integral constant}}\
//expected-note{{non-literal type}}
int arr[([](T i) { return i; })(3)]; //expected-error{{inside of a constant expression}}\
//expected-error{{must have a constant size}}
int (*fp)(T) = [](T i) { return i; };
void fooptr(T (*fp)(char) = [](char c) { return 0; }) { }
int L2 = ([](auto i) { return i; })(2);
void fooG(T i = ([] (auto i) { return i; })(2)) { }
int BG : ([](auto i) { return i; })(3); //expected-error{{not an integral constant}}\
//expected-note{{non-literal type}}\
//expected-error{{inside of a constant expression}}
int arrG[([](auto i) { return i; })(3)]; //expected-error{{must have a constant size}} \
//expected-error{{inside of a constant expression}}
int (*fpG)(T) = [](auto i) { return i; };
void fooptrG(T (*fp)(char) = [](auto c) { return 0; }) { }
template<class U = char> int fooG2(T (*fp)(U) = [](auto a) { return 0; }) { return 0; }
template<class U = char> int fooG3(T (*fp)(U) = [](auto a) { return 0; });
};
};
template<class T>
template<class U>
int X1::X2<T>::fooG3(T (*fp)(U)) { return 0; }
X1::X2<int> x2; //expected-note 3{{in instantiation of}}
int run1 = x2.fooG2();
int run2 = x2.fooG3();
} // end ns
} //end ns inclass_lambdas_within_nested_classes
namespace pr21684_disambiguate_auto_followed_by_ellipsis_no_id {
int a = [](auto ...) { return 0; }();
}
namespace PR22117 {
int x = [](auto) {
return [](auto... run_args) {
using T = int(decltype(run_args)...);
return 0;
};
}(0)(0);
}
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