A quick way to replicate the old behavior using synchronized(Object)

[downs]

gentoo-pc ~ $ cat test50.d; echo "==="; gdc test50.d -o test50 && ./test5
0
import std.stdio;

template _SyncObject(string KEY) {
  Object obj;
  static this() { obj = new Object; }
}

template SyncObject(string KEY) {
  alias _SyncObject!(KEY).obj SyncObject;
}

void main() {
  writefln(SyncObject!("main_1") is SyncObject!("main_1"));
  writefln(SyncObject!("main_1") !is SyncObject!("main_2"));
  synchronized (SyncObject!("main_1")) {
    writefln("Test");
  }
}
===
true
true
Test