How can I check if template variable parameter is iterable before handle it?

[Marcone via Digitalmars-d-learn]

import std;

void foo(T)(T bar){
	static if (bar.isiterable()) // Need Somethin to check if bar is 
iterable.
        {
                // Execute it if bar is iterable.
                foreach (i; bar)
                {
                }
        }
        else {
                // Execute it if bar is NOT iterable.
        }

}

void main(){
        foo(1);
        foo([1, 2, 3, 4, 5]);
}