located-base

Location-aware variants of partial functions.

This library provides variants of standard partial functions that include their call-site in the error message when they crash.

For example:

ghci> Data.List.Located.head []
*** Exception: Prelude.head: empty list
Callstack:
  error, called at src/Data/List/Located.hs:19:14 in locat_KhGZ7Rz1bn9DKFeFxhawNB:Data.List.Located
  head, called at <interactive>:6:1 in interactive:Ghci1