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-Wconversion is very poor


I've turned on all warnings to have clean program. 
Turn on -Wconversion but it will not care about BIG trouble in C++:
conversion.

class A{
public:
A(unsigned	int){}
};

class B{
public:
B(A){}
};

B b(-1); //OK without warnings
int	main(void){}

----
-1 => A(FF..FF) => B(FF..FF)
I want to see all program like:

B b(A(-1));

Which warning I must to set?

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