-- Support for property checking module TProperty where -- prop> \(l::[Bool]) -> head l -- *** Failed! (after 1 test): -- Exception: -- Prelude.head: empty list -- CallStack (from HasCallStack): -- error, called at libraries/base/GHC/List.hs:1782:3 in base:GHC.List -- errorEmptyList, called at libraries/base/GHC/List.hs:89:11 in base:GHC.List -- badHead, called at libraries/base/GHC/List.hs:83:28 in base:GHC.List -- head, called at :1:27 in interactive:Ghci2 -- []