[phobos] std.string.format

[Martin Nowak]

I'm a little tired of repeating this code snippets over and over again.

string formatString(Args...)(string fmt, auto ref Args args)
{
    import std.array, std.format;
    auto app = appender!string();
    formattedWrite(app, fmt, args);
    return app.data;
}

What's the reason that std.string.format defaults to vararg formatting?
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