Richard Feldman (Nov 20 2023 at 22:05): Richard Feldman (Nov 20 2023 at 22:05):in this post I noticed that there's an unreachable branch in a when:
when err is
IOError _ _ -> "Error reading dir"
there won't be a tag of type IOError there at that point (in part because we didn't wrap the possible I/O errors in an outer tag to facilitate matching like this; whoops - we should change it from IOError to [IOError IOError]), but there's no compiler warning about it.
Richard Feldman (Nov 20 2023 at 22:05):does anyone know if this is a bug, or if we just don't report unreachable branches like this?
Ayaz Hafiz (Nov 21 2023 at 00:59):https://github.com/roc-lang/roc/issues/3692
Ayaz Hafiz (Nov 21 2023 at 00:59):https://github.com/roc-lang/roc/pull/3601 is a super old PR that implements the basic version to do this check
Last updated: Dec 21 2025 at 12:15 UTC