haskell-process-load-file error (wrong-type-argument number-or-marker-p nil) when code has an error

[XinhuaZhang]

Hello,

When I use C-c C-l, which is haskell-process-load-file command, and if there is an error in my code, this error shows. However, if the code is correct, then there is no such error.

(wrong-type-argument number-or-marker-p nil)

If I use :l filename.hs in the haskell buffer, it works correctly, no error at all.

I wonder what is going on?

[gracjan]

@bergey, is this because of your recent changes?

[XinhuaZhang]

I have the other computer which has an old version 20151102.256 and it works fine.

[bergey]

@XinhuaZhang Can you run M-x toggle-debug-on-error and post the backtrace for that wrong-type-argument? Also, on the computer running 21151102.256, is the command that works fine haskell-process-load-file or haskell-process-load-or-reload? b0f04d1 changed the default binding for C-c C-l

I haven't managed to reproduce this yet. When I have an error in my haskell file, haskell-process-load-file shows an error in the minibuffer, like Setup.hs:2:8: Not in scope: ‘defaultMain’ or Parse error: naked expression at top level.

@gracjan Maybe, but it's not obvious to me how. I didn't change haskell-process-load-file at all. I'm happy to take point on fixing it, since I've looked at these functions recently.

[XinhuaZhang]

@bergey After I run M-x toggle-debug-on-error and then run either haskell-process-load-file or haskell-process-load-or-reload there is no backtrace showing up. haskell-process-reload has the same problem.

[XinhuaZhang]

@bergey I think I have figured out the problem. The path to the file is something like "abc/Ubuntu One/def", there is a space between Ubuntu and One. There is no Ubuntu One any more, I am still doing my work in the directory somehow.

[bergey]

Aha! Thanks for following up. I was stumped trying to reproduce the issue. Do you mean that you moved the Haskell file, and emacs doesn't know about the rename? Can we close this, or is there still a problem that we should fix?

[XinhuaZhang]

If there is no space in the path to the Haskell file, then it is fine.

[gracjan]

Supporting spaces in project paths is one of the things that we should do someday.

[Ericson2314]

^ I hope there is an issue for that?

[gracjan]

There is now :)