[Issue 14232] redundant attribute 'const'

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14232

--- Comment #13 from Martin Nowak <code at dawg.eu> ---
Thanks @dicebot.
It's this error you're triggering.
https://github.com/9rnsr/dmd/commit/1b932b9282df6ed312b6da0031417ea0d4f8faa5#diff-62dcb5f0ffc3089b7565897d8beb3322R918

At best you pass a `bool onlyWarn = false` to `appendStorageClass`, and then
pass `true` for places were it didn't previously error.

The actual error was introduced here.
https://github.com/D-Programming-Language/dmd/pull/3689

Be careful to preserve existing errors.
https://github.com/9rnsr/dmd/commit/1b932b9282df6ed312b6da0031417ea0d4f8faa5#diff-62dcb5f0ffc3089b7565897d8beb3322R503

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