Unused druntime code: Barrier, ReadWriteMutex, Condition

[Richard (Rikki) Andrew Cattermole]

On 18/06/2026 7:19 AM, Nick Treleaven wrote:
> On Tuesday, 16 June 2026 at 10:41:00 UTC, Richard (Rikki) Andrew 
> Cattermole wrote:
>> ```d
>> version(NoBarrier) {
>>     @disable
>>     class Barrier {}
>> } else {
>> ```
> 
> `@disable` doesn't work with types. You can do `@disable new();` though.
> 
> The spec should be clearer:
> 
>> A reference to a declaration marked with the @disable attribute causes 
>> a compile time error.
> 
> https://dlang.org/spec/attribute.html#disable

That should really be fixed to make @disable work on types.