"parse error in ghcmod: Could not parse..." using ghc-mod >= 4.1.0

[ghost]

When using ghc-mod 4.1.0 or newer (including current git HEAD), ghcmod-vim HEAD outputs the following on most files:

|| parse error in ghcmod! Could not parse the following ghc-mod output: (use -v for more information)

[eagletmt]

Are you using the latest ghcmod-vim?
I think it was fixed in 89ba722 .

[ghost]

Yes, I am using HEAD at the moment.

It happens much more rarely now, so I suppose there's something else not being parsed correctly. A project I have handy where it always outputs this error for all src files is bweakfwu. If you clone it and run ghcmod-vim on e.g. this file: https://github.com/plaimi/bweakfwu/blob/master/src/Main.hs -- you should see the error.

[eagletmt]

It works for me.

git clone https://github.com/plaimi/bweakfwu
cd bweakfwu
vim bweakfwu.cabal  # Remove GLUT version constraint
cabal sandbox init
cabal install -j4 --only-dependencies --enable-tests
vim src/Main.hs

:GhcModCheck

Could you show me the output of ghc-mod check src/Main.hs from terminal?

[ghost]

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On 14/05/14 14:16, Kohei Suzuki wrote:

Could you show me the output of ghc-mod check src/Main.hs from
terminal?
A-ha! If I do a clean clone, I get:

|| parse error in ghcmod! Could not parse the following ghc-mod
output:cabal: Could not resolve dependencies:

Which is a bit wonky, but hardly cryptic. However, if I run it on the
checkout I have on my computer, I get:

$ ghc-mod check src/Main.hs
src/Main.hs:0:0:Error:: cannot satisfy -package-id
gloss-1.8.1.2-b18cf0a4ac180df2e29f749fd1647fa8

And it is on this particular checkout I get the ghcmod-vim parse error:

Main.hs|| : cannot satisfy -package-id
gloss-1.8.1.2-b18cf0a4ac180df2e29f749fd1647fa8
|| parse error in ghcmod! Could not parse the following ghc-mod
output: (use -v for more information)

So the problem is elusive.

---

Alexander
[email protected]
https://secure.plaimi.net/~alexander
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[eagletmt]

If I remove gloss package, I get the same error message from ghc-mod.

% cabal sandbox hc-pkg unregister gloss-1.8.2.1
% ghc-mod check src/Main.hs
src/Main.hs:0:0:Error:<command line>: cannot satisfy -package-id gloss-1.8.2.1-d98827a4646458cb2aafeebc1f757d1d
    (use -v for more information)

But I don't get any parse error from ghcmod-vim.
ghc-mod's error message is sent to stderr and ghcmod-vim just ignores it.