Method push

ij/src/main/java/ij/macro/Interpreter.java:1880–1889

(Variable var, Interpreter interp)

	}

	Variable push(Variable var, Interpreter interp) {
		if (stack==null)
			stack = new Variable[STACK_SIZE];
		if (topOfStack>=(STACK_SIZE-2))
			interp.error("Stack overflow");
		else
			topOfStack++;
		stack[topOfStack] = var;
		return var;
	}

	void pushGlobals() {
		if (pgm.globals==null)