[Haskell-cafe] Suggestion for error message improvement

Zachary Kessin zkessin at gmail.com
Wed Oct 26 06:57:05 UTC 2016

When I compiled some code this morning I got an error that said that I
should edit my cabal file, but I notice that one thing is missing, the path
to the cabal file. Having that in the error message would make fixing it a
bit easier and faster in that emacs could take me right to the correct
cabal file and that I would know for sure which one it was using.

I tried filing this as a bug on the stack github repo but they said it is a
ghc issue.

[1 of 1] Compiling Main             ( tests/test.hs,

/home/zkessin/Documents/*****/tests/test.hs:17:1: error:
    Failed to load interface for ‘Control.Lens’
    It is a member of the hidden package ‘lens-4.14’.
    Perhaps you need to add ‘lens’ to the build-depends in your .cabal file.
    Use -v to see a list of the files searched for.
Progress: 1/2
--  While building package ***********- using:
--builddir=.stack-work/dist/x86_64-linux/Cabal- build
lib:********** test:test --ghc-options " -ddump-hi -ddump-to-file"
    Process exited with code: ExitFailure 1

Zach Kessin
SquareTarget <http://squaretarget.rocks?utm_source=email-sig>
Twitter: @zkessin <https://twitter.com/zkessin>
Skype: zachkessin
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