#15436: Compile-time panic, Prelude.!!: negative index -------------------------------------+------------------------------------- Reporter: pbrisbin | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.5 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Compile-time | Test Case: crash or panic | simplCore/should_run/T15436 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D5008 Wiki Page: | -------------------------------------+------------------------------------- Comment (by hvr): I was just about to finally file this bug I ran into back in May already w/ GHC 8.4.2 but didn't have time to investigate and instead workarounded via https://github.com/text-utf8/text- utf8/commit/5ba8f5d1d4c0f39399d8c32f069e4132c92ef099 It'd be great to have this fixed in GHC 8.4.4 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15436#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler