Bug#916434: ghc: panics while building Agda on armhf

[Ilias Tsitsimpis]

Package: ghc
Version: 8.4.4+dfsg1-1
Severity: normal
Tags: upstream
Forwarded: https://ghc.haskell.org/trac/ghc/ticket/16028

ghc-8.4.4 panics while building Agda on armhf[1]. The same version of
Agda builds fine with ghc-8.4.3[2].

	ghc: panic! (the 'impossible' happened)
	  (GHC version 8.4.4 for arm-unknown-linux):
		tyThingCoAxiom
	  Identifier ‘fromDescListWithKey’
	  Call stack:
		  CallStack (from HasCallStack):
			callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in ghc:Outputable
			pprPanic, called at compiler/main/HscTypes.hs:2153:32 in ghc:HscTypes

	Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

[1] https://buildd.debian.org/status/fetch.php?pkg=agda&arch=armhf&ver=2.5.4.1-3%2Bb1&stamp=1544132023&raw=0
[2] https://buildd.debian.org/status/fetch.php?pkg=agda&arch=armhf&ver=2.5.4.1-3&stamp=1540145469&raw=0

-- 
Ilias