I find it a bit confusing because the commit dates back to 2015 while
#13547: ghc: panic! StgCmmEnv: variable not found -------------------------------------+------------------------------------- Reporter: cipher1024 | Owner: (none) Type: bug | Status: infoneeded Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 (CodeGen) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: 10158 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): Replying to [comment:16 cipher1024]: literate-unitb worked with ghc-8.0.1 up until november 2016. I'm not sure what you mean by this, especially since the version of `Proofs2.hs` that I attached also panics with GHC 8.0.1. But moreover, it's important to note that you can't divide up GHC's commit history into discrete chunks corresponding to each GHC version. We operate by selectively merging commits from HEAD into release branches. So even though the `ApplicativeDo` patch was first committed back in 2015, it didn't actually appear in a major release (8.0) until much later, since we waited until we had made a couple of point releases for GHC 7.10 before putting new, breaking changes (including `ApplicativeDo`) in a major 8.0 release. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13547#comment:17 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler