The format string. When passed as a compile-time argument, the string will be statically checked against the argument types passed.
Items to write.
Note: In older versions of Phobos, it used to be possible to write:
writef(stderr, "%s", "message");
to print a message to stderr. This syntax is no longer supported, and has been superceded by:
Writes formatted data to standard output (without a trailing newline).