ghc: panic! (the 'impossible' happened) - find_tycon

$ stack build
server-0.0.0.1: build

--  While building package server-0.0.0.1 using:
      /home/martijn/.stack/setup-exe-cache/x86_64-linux/setup-Simple-Cabal-1.24.0.0-ghc-8.0.1 --builddir=.stack-work/dist/x86_64-linux/Cabal-1.24.0.0 build lib:server exe:server --ghc-options " -ddump-hi -ddump-to-file"
    Process exited with code: ExitFailure 1
    Logs have been written to: /home/martijn/server/.stack-work/logs/server-0.0.0.1.log

    Preprocessing library server-0.0.0.1...
    [20 of 20] Compiling Application      ( src/Application.hs, .stack-work/dist/x86_64-linux/Cabal-1.24.0.0/build/Application.o )
    ghc: panic! (the 'impossible' happened)
      (GHC version 8.0.1 for x86_64-unknown-linux):
    	find_tycon
      YesodSubRunnerEnv
      []
    
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Trac metadata

Trac field	Value
Version	8.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	high
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

changed weight to 7

added Tbug Trac import labels

closed

I'm fairly sure this is a duplicate but without any reproduction instructions there is no way for me to verify this! Please reopen this ticket with more details if it isn't fixed in the 8.0.2 release.

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedDuplicate

added compiler crash label

added Phigh label