[Issue 23601] [std.format] acceptedSpecs do match baseOfSpec

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23601

--- Comment #1 from João Lourenço <jlourenco5691 at gmail.com> ---
Another core feature that does not work is ignoring values with '*' with a
compile-time format string. The reasoning is the same as above, the validation
goes through the 'write' version, and because the meaning is different, the
following should compile but doesn't
```d
import std;

void main()
{
    int i;
    "123".formattedRead!"%d %*u"(i).writeln;
}
```

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