GNU bug report logs - #37366
ghci can't find System.IO

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: P <pronaip <at> protonmail.com>
To: "bug-guix <at> gnu.org" <bug-guix <at> gnu.org>
Subject: ghci can't find System.IO
Date: Tue, 10 Sep 2019 09:49:47 +0000

with the latest ghc (qhws2nyqmjansrnqf78mz87l74v01mfx-ghc-8.6.5) i cannot start ghci, due to the following error[1]

I do not have any other Haskell package in my profile


[1]:
```
GHCi, version 8.6.5: http://www.haskell.org/ghc/  :? for help

<interactive>:1:6: error:
    Not in scope: ‘System.IO.hSetBuffering’
    No module named ‘System.IO’ is imported.

<interactive>:1:30: error:
    Not in scope: ‘System.IO.stdin’
    No module named ‘System.IO’ is imported.

<interactive>:1:46: error:
    Not in scope: data constructor ‘System.IO.NoBuffering’
    No module named ‘System.IO’ is imported.

<interactive>:1:70: error:
    Not in scope: ‘System.IO.hSetBuffering’
    No module named ‘System.IO’ is imported.

<interactive>:1:94: error:
    Not in scope: ‘System.IO.stdout’
    No module named ‘System.IO’ is imported.

<interactive>:1:111: error:
    Not in scope: data constructor ‘System.IO.NoBuffering’
    No module named ‘System.IO’ is imported.

<interactive>:1:135: error:
    Not in scope: ‘System.IO.hSetBuffering’
    No module named ‘System.IO’ is imported.

<interactive>:1:159: error:
    Not in scope: ‘System.IO.stderr’
    No module named ‘System.IO’ is imported.

<interactive>:1:176: error:
    Not in scope: data constructor ‘System.IO.NoBuffering’
    No module named ‘System.IO’ is imported.
```

Message #10 received at 37366-done <at> debbugs.gnu.org (full text, mbox):

From: Royce Strange <royball <at> disroot.org>
To: 37366-done <at> debbugs.gnu.org
Subject: ghci can't find System.IO
Date: Wed, 10 Jun 2020 23:25:27 -0500

Hello.

Found the ghc reported to have issues:
https://ci.guix.gnu.org/build/1567747/details

Going back in time to the commit that corresponds
with the ghc that was reported to be broken:
-----
$ guix time-machine --commit=caa366ec230ccc42f5c8d90d36e8cac933053a81 \
-- environment --pure --ad-hoc ghc

[env]$ ghci
GHCi, version 8.6.5: http://www.haskell.org/ghc/  :? for help

<interactive>:1:6: error:
    Not in scope: `System.IO.hSetBuffering'
    No module named `System.IO' is imported.

<interactive>:1:30: error:
    Not in scope: `System.IO.stdin'
    No module named `System.IO' is imported.
...
...
-----
It was indeed broken.

I believe 83aa6562173e06e8fafd4857a2e708feabfe56f8 fixed this.
Validating that ghci can actually start properly now
with a current version of guix:
-----
$ guix --version
guix (GNU Guix) 2971ed57345ee4e00058efeaf27c6a0790fdc9dd

$ guix environment --pure --ad-hoc ghc -- ghci
GHCi, version 8.6.5: http://www.haskell.org/ghc/  :? for help
Prelude> 1 + 2
3
-----

Going to go ahead and close.

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