Package: ghc Version: 8.4.3+dfsg1-4 Severity: normal Dear Maintainer,
Since updating to ghc 8.4.3, the 'impossible' is easy to trigger in GHCi: $ ghci GHCi, version 8.4.3: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/hym/c/ghci Prelude> readFile "/tmp/test" ghc: panic! (the 'impossible' happened) (GHC version 8.4.3 for x86_64-unknown-linux): nameModule system $dShow_a4My Call stack: CallStack (from HasCallStack): callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in ghc:Outputable pprPanic, called at compiler/basicTypes/Name.hs:241:3 in ghc:Name Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug (I get this error whether /tmp/test exists or not). Best regards, Samuel -- System Information: Debian Release: buster/sid APT prefers unstable APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental') Architecture: amd64 (x86_64) Kernel: Linux 4.18.0-2-amd64 (SMP w/2 CPU cores) Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages ghc depends on: ii dpkg 1.19.2 ii gcc 4:8.2.0-2 ii libatomic1 8.2.0-10 ii libbsd-dev 0.9.1-1 ii libc6 2.27-8 ii libc6-dev 2.27-8 ii libffi-dev 3.2.1-8 ii libffi6 3.2.1-8 ii libgmp-dev 2:6.1.2+dfsg-3 ii libgmp10 2:6.1.2+dfsg-3 ii libncurses-dev [libncurses5-dev] 6.1+20181013-1 ii libncurses5-dev 6.1+20181013-1 ii libtinfo6 6.1+20181013-1 ghc recommends no packages. Versions of packages ghc suggests: ii ghc-doc 8.4.3+dfsg1-4 pn ghc-prof <none> pn haskell-doc <none> ii llvm-6.0 1:6.0.1-9.2 ii perl 5.28.0-4 -- no debconf information