g++ 4.0.0: ambiguous conversion resolved in favor of conversion operator?

[Angel Tsankov]

g++ 4.0.0 compiles the following code (and calls the conversion operator). However, this code is ambiguous and should not compile. 
Is this bug fixed in later releases?

struct b;
struct a
{
a( ) { }
a( b const& ) { }
};

struct b
{
operator a( ) const { return a( ); }
};

void f( a )
{
}

int main
(
)
{
b B;
f( B );

return 0;
} 

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