On Tuesday, 4 July 2023 at 12:43:19 UTC, Steven Schveighoffer wrote: > On 7/4/23 12:58 AM, kiriakov wrote: > It looks like a type mismatch. The function accepted should > return `Result` but it's returning `ParsResult`. > > -Steve That's the problem Result(T) = SumType!(ParsResult!T, Err!T)