changing the output of `std.stdio.write'

[Manfred Nowak via Digitalmars-d-learn]

According to this tutorial
  https://wiki.dlang.org/Defining_custom_print_format_specifiers
it seems easy to change the format of the output for 
`std.stdio.writef'.

But why is there no example for changing the output when there 
are no format specifiers?

-manfred