Initializing global delegate variable - bug or on purpose?

[Atila Neves via Digitalmars-d-learn]

int delegate(int) dg = (i) => i * 2;

Error: non-constant nested delegate literal expression __lambda3


int delegate(int) dg;

static this() {
   dg = i => i * 2; // ok
}


Am I doing anything wrong?

Atila