dmd debug(level) Is it obsolete?

[Nick Treleaven]

On Sunday, 17 August 2025 at 14:59:00 UTC, Brother Bill wrote:
> Page 462 of book: Programming in D
>
> This won't compile.  Is this obsolete?
> ```
> app.d(8,8): Error: identifier expected inside `debug(...)`, not 
> `1`
>     debug(1) writeln("entered myFunction");
>           ^

Yes, for rationale see:
https://dlang.org/changelog/2.101.0.html#dmd.deprecate_version_int