[Pkg-emacsen-addons] Bug#931122: haskell-mode: interactive mode fails to parse ghci start message

[Dylan Thurston]

Package: haskell-mode
Version: 16.1-6
Severity: normal

Dear Maintainer,

When starting interactive-haskell-mode with the current ghc (8.4.4),
the mode does not correctly parse the line indicating how many modules
are loaded.

To reproduce:
------------------------------------------------------------
% emacs -q t.hs [attached, dummy file]
* M-x interactive-haskell-mode
* M-l
------------------------------------------------------------
results in
  Haskell Process command errored with: (error "Unexpected response from haskell process.")

You can see the problem by running ghci manually:
------------------------------------------------------------
% ghci t.hs
GHCi, version 8.4.4: http://www.haskell.org/ghc/  :? for help
[1 of 1] Compiling Main             ( t.hs, interpreted ) [flags changed]
Ok, one module loaded.
*Main> 
------------------------------------------------------------

This response, "Ok, one module loaded", is not what the code in
haskell-load.el is expecting. This is addressed upstream here:
  https://github.com/haskell/haskell-mode/issues/1553
That's from a previous iteration of the message, the current github
code apparently handles up to GHC 8.6.3.

This makes interactive-haskell-mode almost useless.

-- System Information:
Debian Release: 10.0
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-4-amd64 (SMP w/4 CPU cores)
Kernel taint flags: TAINT_WARN
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8), LANGUAGE=en_US.utf8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages haskell-mode depends on:
ii  elpa-haskell-mode  16.1-6

haskell-mode recommends no packages.

haskell-mode suggests no packages.

-- no debconf information
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