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// RUN: %clang_cc1 -std=c++2a -verify %s
struct A {};
constexpr int operator<=>(A a, A b) { return 42; }
static_assert(operator<=>(A(), A()) == 42);
int operator<=>(); // expected-error {{overloaded 'operator<=>' must have at least one parameter of class or enumeration type}}
int operator<=>(A); // expected-error {{overloaded 'operator<=>' must be a binary operator}}
int operator<=>(int, int); // expected-error {{overloaded 'operator<=>' must have at least one parameter of class or enumeration type}}
int operator<=>(A, A, A); // expected-error {{overloaded 'operator<=>' must be a binary operator}}
int operator<=>(A, A, ...); // expected-error {{overloaded 'operator<=>' cannot be variadic}}
int operator<=>(int, A = {}); // expected-error {{parameter of overloaded 'operator<=>' cannot have a default argument}}
struct B {
int &operator<=>(int);
friend int operator<=>(A, B);
friend int operator<=>(int, int); // expected-error {{overloaded 'operator<=>' must have at least one parameter of class or enumeration type}}
void operator<=>(); // expected-error {{overloaded 'operator<=>' must be a binary operator}};
void operator<=>(A, ...); // expected-error {{overloaded 'operator<=>' cannot be variadic}}
void operator<=>(A, A); // expected-error {{overloaded 'operator<=>' must be a binary operator}};
};
int &r = B().operator<=>(0);
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