Using std.format required std.string?

[Robert M. Münch via Digitalmars-d-learn]

Hi, wondering why this happens:

import std.format;

void ods(T...)(auto ref T args){
  format(args).ptr;
  return;
}

ods("%s @ %s", mystring, mystring.ptr);

>> Error: undefined identifier format

If I add: "import std.string;" everything compiles and works.

Since the docs of std.format contains all the format specifier 
description etc. I would expect that only including "std.format" should 
be enough.

-- 
Robert M. Münch
http://www.saphirion.com
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