another nube question -- segfaults

[Rob Dunne]

HI all,

I have

a) upgraded ghc  7.8.4 to 7.10.2

b) cloned the course directory again

c) made a two line change to src/Course/List.hs  i.e.

(++) =

    error "todo: Course.List#(++)"

to

(++) list1 list2 =

        foldRight (:.) list2 list1

and still I get a segfault using the ++ operator.

I have removed all directories like .ghc .cabal .cabal-sandbox from the top level -- just in case something ghci is picking up something from there.

what else can I try?

Bye

Rob

git  clone  https://github.com/NICTA/course

localhost: chmod og-wr course

localhost: cd course/

localhost: chmod og-wr .ghci 

localhost: cd src/Course

localhost: cp List.hs List.hs.bak

localhost: vi List.hs

localhost: diff List.hs List.hs.bak 

169,170c169,170

< (++) list1 list2 =

<        foldRight (:.) list2 list1

---

> (++) =

>   error "todo: Course.List#(++)"

localhost: cd ../../

localhost: ghci

GHCi, version 7.10.2: http://www.haskell.org/ghc/  :? for help

[ 1 of 28] Compiling Course.Core      ( src/Course/Core.hs, interpreted )

.

.

>> :t (++)

(++) :: List a -> List a -> List a

>> Nil ++ Nil

Segmentation fault (core dumped)

[David Tchepak]

By "cloned again" do you mean over an existing clone? If so make sure you also remove `./dist` from the course directory -- this caused me problems when I updated to 7.10.2. :)

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[Rob Dunne]

Hi David,

no, I deleted the course directory and started
afresh so there is no "./dist" directory in course.

I notice that
> let aa = Nil ++ Nil
causes no problems

> show aa
or
> aa
cause the segfault

R