import strangeness with std.stdio.write

[psychoticRabbit via Digitalmars-d-learn]

So, strange problem below.

The commented-out line will not compile (if I un-comment it), 
unless I either move std.stdio into main, or, move std.file out 
of main.

Whereas writeln works just fine as is.

---------------------
module test;

import std.stdio;

void main()
{
    import std.file;

    //write("hello");
    writeln("hello again");
}
-----------------------