Implicit conversions through purity

[bearophile]

Is it possible and a good idea to allow code like the function 
foo2?


string foo1(in string s) pure nothrow {
     auto s2 = s.dup;
     s2[0] = 'a';
     return s2; // OK.
}

void foo2(in string s, ref string sOut) pure nothrow {
     auto s2 = s.dup;
     s2[0] = 'a';
     sOut = s2; // Error: cannot implicitly convert
}

void foo3(in string s, out string sOut) pure nothrow {
     auto s2 = s.dup;
     s2[0] = 'a';
     sOut = s2; // Error: cannot implicitly convert
}

void main() {}


Bye,
bearophile