printf argument validation

[tester]

On Wednesday, 26 February 2020 at 05:55:26 UTC, Walter Bright 
wrote:
> https://github.com/dlang/dmd/pull/10812
>
> Now it's time for someone to take this code and modify it to do 
> scanf, too! I.e. need a chkscanf.d.
>
> It's an easy project for someone wishing to get into 
> contributing to D.

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