unsafe is:package

package unsafe
Uses
Unified interface to unsafe functions SafeHaskell introduced the notion of safe and unsafe modules. In order to make as many as possible modules "safe", the well-known unsafe functions were moved to distinguished modules. This makes it hard to write packages that work with both old and new versions of GHC. This package provides a single module System.Unsafe that exports the unsafe functions from the base package. It provides them in a style ready for qualification, that is, you should import them by 
import qualified System.Unsafe as Unsafe
The package also contains a script called rename-unsafe.sh. It replaces all occurrences of the original identifiers with the qualified identifiers from this package. You still have to adapt the import commands. It uses the darcs-replace-rec script from the darcs-scripts package.
package unsafe-promises
Uses
Not on Stackage, so not searched. Create pure futures using lazy IO.
package unsafely
Uses
Not on Stackage, so not searched. Flexible access control for unsafe operations and instances
package unsafeperformst
Uses
Not on Stackage, so not searched. Like unsafeperformIO, but for the ST monad.
package hsc3-unsafe
Uses
Not on Stackage, so not searched. Unsafe Haskell SuperCollider
package yaya-unsafe
Uses
Not on Stackage, so not searched. Non-total extensions to the Yaya recursion scheme library.
package yaya-unsafe-test
Uses
Not on Stackage, so not searched. Test suites for `yaya-unsafe`.