DMD 2.062 Win32

import std.stdio, std.typecons;

void main()
{
    int ee = 0;
    static if (__traits(compiles, { Unique!int(&ee);}))
       auto e = Unique!int(&ee);
    writeln(e); // required to trigger
}

With the static if conditional (which passes) the writeln line causes the program to hang indefinitely after printing the expected result. Remove the static if conditional, and the program does not hang, behaves correctly.