hanchenye-llvm-project/clang/test/SemaCXX/default1.cpp

// RUN: %clang_cc1 -fsyntax-only -verify %s
void f(int i);
void f(int i = 0); // expected-note {{previous definition is here}}
void f(int i = 17); // expected-error {{redefinition of default argument}}


void g(int i, int j, int k = 3);
void g(int i, int j = 2, int k);
void g(int i = 1, int j, int k);

void h(int i, int j = 2, int k = 3, 
       int l, // expected-error {{missing default argument on parameter 'l'}}
       int,   // expected-error {{missing default argument on parameter}}
       int n);// expected-error {{missing default argument on parameter 'n'}}

struct S { } s;
void i(int = s) { } // expected-error {{no viable conversion}} \
// expected-note{{passing argument to parameter here}}

struct X { 
  X(int);
};

void j(X x = 17);

struct Y { // expected-note 2{{candidate}}
  explicit Y(int);
};

void k(Y y = 17); // expected-error{{no viable conversion}} \
// expected-note{{passing argument to parameter 'y' here}}

void kk(Y = 17); // expected-error{{no viable conversion}} \
// expected-note{{passing argument to parameter here}}