On Thursday, 29 June 2023 at 14:18:05 UTC, kiriakov wrote:
How to create option type over std.sumtype ?``` enum None; struct Some(T) { T x; } alias Option = SumType!(Some!T, None); ``` I get Error: undefined identifier `T`
Try ```d alias Option(T) = SumType!(Some!T, None); ```Your version of `Option` isn't a template, so it doesn't know what `T` is. This version uses the eponymous template syntax for aliases.
