Test failures on ghc 9.4.2

[danwdart]

Not sure what it's all about but here it is:

running tests
Running 2 test suites...
Test suite slist-doctest: RUNNING...
src/Slist.hs:386: failure in expression `head mempty'
expected: *** Exception: Prelude.head: empty list
 but got: *** Exception: Prelude.head: empty list
          CallStack (from HasCallStack):
          ^
            error, called at libraries/base/GHC/List.hs:1646:3 in base:GHC.List
            errorEmptyList, called at libraries/base/GHC/List.hs:85:11 in base:GHC.List
            badHead, called at libraries/base/GHC/List.hs:81:28 in base:GHC.List
            head, called at src/Slist.hs:391:8 in main:Slist

src/Slist.hs:416: failure in expression `last mempty'
expected: *** Exception: Prelude.last: empty list
 but got: *** Exception: Prelude.last: empty list
          CallStack (from HasCallStack):
          ^
            error, called at libraries/base/GHC/List.hs:1646:3 in base:GHC.List
            errorEmptyList, called at libraries/base/GHC/List.hs:156:13 in base:GHC.List
            lastError, called at libraries/base/GHC/List.hs:151:29 in base:GHC.List
            last, called at src/Slist.hs:425:8 in main:Slist

src/Slist.hs:1477: failure in expression `unsafeAt (-1) sl'
expected: *** Exception: Prelude.!!: negative index
 but got: *** Exception: Prelude.!!: negative index
          CallStack (from HasCallStack):
          ^
            error, called at libraries/base/GHC/List.hs:1371:12 in base:GHC.List
            negIndex, called at libraries/base/GHC/List.hs:1375:17 in base:GHC.List
            !!, called at src/Slist.hs:1485:30 in main:Slist

Examples: 227  Tried: 225  Errors: 0  Failures: 3

Thanks

[danwdart]

Awesome, thanks!