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			Function std.stdio.File.writef
			Writes its arguments in text format to the file, according to the format in the first argument.
Prototype
void writef(Char, A...)( Char[] fmt, A args );
Throws
Exception if the file is not opened.
        ErrnoException on an error writing to the file.
Authors
Walter Bright, Andrei Alexandrescu, Alex Rønne Petersen