version(good) works. version(bad) does not. Can we make std.conv.to work for out-of-class opCast? Use case: same reason as UFCS, where we don't wanna define all methods inside class def, leading to possible extensions later. Currently this IS a problem when class A is in a library over which we have no control and a user defined class B wants to cast from A.
---- import std.conv; struct B{ int x;} struct A{ int x; version(good) auto opCast(T)() {return B(x);} } version(bad) auto opCast(T)(A a) {return B(a.x);} void main(){ auto b=to!B(A.init); } ----