[Issue 21494] std.stdio.readf second example does not compile

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21494

--- Comment #1 from wolframw <wolframw at protonmail.com> ---
The page seems to be outdated. The example on
https://dlang.org/phobos/std_stdio.html#.File.readf works.

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