$ /tmp/dmd2/linux/bin64/dmd -version=BUG foo.d
foo.d(16): Error: struct foo.Foo is not copyable because it is annotated with @disable
$ cat foo.d
struct Foo {
  version(BUG) {
    @disable this(this);
  }
  this(ref inout(Foo) other) {
    import std.stdio;
    writeln("Copy Construtor");
  }
}
void main() {
  Foo d;
  Foo e = d;			// copy -- no issue
  Foo[] foos;
  // foos.length = foos.length + 1;
  // foos[$-1] = d;		// opAssign into array element -- no issue
  foos ~= d;			// <<<<<< does not compile
}