BUG: No Compiler Error for Ambiguous C++ Conversion

MORE INFORMATION

Sample Code

/* Compile options needed: none
*/ 

#include <iostream.h>

class B;

class A
{
public:
    // This is the function the compiler
    // chooses to call.
     A(B&) { cout << "called A::A(B&)" << endl; }
};

class B
{
public:
     operator A()  // This function does not get called.
     {
          B b;
          cout << "called operator B::A()" << endl;
          return b;
     }
};

void main()
{
        B b;
        A a = b; // A(b) or b.operator A()?
                 // The compiler should issue an
                 // error here but instead chooses
                 // to call A::A(B&).

        cout << "failed: should not compile- see ARM 12.3.2" << endl;
}