Which section of the standard should I refer to to resolve the
following ambiguity?

For the code fragment below, I get conflicting results on different
compilers I have
access to. One compiler doesn't complain and the other does.

Compilation requires that the compiler determine that application of
the available
conversion operator is sufficient to allow a built-in operator==(int,
int) to be applied.

class C
{
public:
     C(unsigned short);
     friend bool operator==(unsigned short, const C&);

};

class X
{
public:
     operator unsigned short() const;

};

bool fail1(const X& x)
{
     return x == 0x1234;

}

bool fail2(const X& x)
{
     return x == (unsigned short) 0x1234;

}

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