On Friday, 3 September 2021 at 23:39:44 UTC, Per Nordlöw wrote:
When is a phobos unittest supposed to be qualified with version `(StdUnittest)`?
Almost never.`version (StdUnittest)` should be used in Phobos wherever you would normally use a `version (unittest)` block. It is not for the tests themselves, but for test fixtures and support code.