Where is the error?
```
class B
{
public:
B(int i): x(i) {}
// . . .
private:
int x;
};
class D : public B
{
public:
D() { /* . . . */ }
private:
// . . .
};
int main()
{
D y;
return 0;
}
```
There is no default base class constructor for the compiler to call at the definition of
the derived class destructor. One compiler is a bit more generic. It complains that
there is no “appropriate” constructor to call at this point.
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