Skip to content

User defined rules are disabled under Safe Haskell - warning is scary

Does this warning means that just defining new rules is forbidden, or does it mean that no rules fire ever in {-# LANGUAGE Safe #-} modules.

If it's former, then the

Defining user rules is disabled under Safe Haskell

wording would be more precise.

The manual says

RULES — Rewrite rules defined in a module M compiled with Safe are dropped. Rules defined in Trustworthy modules that M imports are still valid and will fire as usual.

So it's the former, I'd suggest changing the warning's wording.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information