https://issues.dlang.org/show_bug.cgi?id=20727
--- Comment #1 from Dlang Bot <dlang-bot@dlang.rocks> --- @Geod24 created dlang/tools pull request #399 "Work around issue 20727 by passing BOOTSTRAP when doing clean" mentioning this issue: - Work around issue 20727 by passing BOOTSTRAP when doing clean As explained in issue 20727, AUTO_BOOTSTRAP is not required for 'clean', but still triggers the error. https://github.com/dlang/tools/pull/399 --