A library wrapping @Prelude@/@Data.List@ functions that can throw
exceptions, such as @head@ and @!!@. Each unsafe function has up to four
variants, e.g. with @tail@:

* @tail :: [a] -> [a]@, raises an error on @tail []@.

* @tailMay :: [a] -> /Maybe/ [a]@, turns errors into @Nothing@.

* @tailDef :: /[a]/ -> [a] -> [a]@, takes a default to return on errors.

* @tailNote :: /String/ -> [a] -> [a]@, takes an extra argument which
supplements the error message.

* @tailSafe :: [a] -> [a]@, returns some sensible default if possible, @[]@
in the case of @tail@.

This package is divided into three modules:

* "Safe" contains safe variants of @Prelude@ and @Data.List@ functions.

* "Safe.Foldable" contains safe variants of @Foldable@ functions.

* "Safe.Exact" creates crashing versions of functions like @zip@ (errors if
the lists are not equal) and @take@ (errors if there are not enough
elements), then wraps them to provide safe variants.

• Anton Zhukharev
• Denis Smirnov

• ghc8.6.4-safe