Building vector with GHC HEAD

[Jan Stolarek]

Devs,

I'm not sure if this is the best place to ask this question but I'm almost certain someone here 
will have the answer. I want to build upstream master branch of vector library using GHC HEAD and 
cabal 1.22. Alas my attempts have failed:

$ git clone git at github.com:haskell/vector.git
$ cd vector
$ cabal sandbox init
$ cabal install -w /dane/projekty/ghc/build/inplace/bin/ghc-stage2
Resolving dependencies...
cabal: Could not resolve dependencies:
trying: vector-0.11.0.0 (user goal)
trying: base-4.8.0.0/installed-inp... (dependency of vector-0.11.0.0)
next goal: deepseq (dependency of vector-0.11.0.0)
rejecting: deepseq-1.4.0.0/installed-inp..., 1.4.0.0 (conflict: vector =>
deepseq>=1.1 && <1.4)
rejecting: deepseq-1.3.0.2 (conflict: base==4.8.0.0/installed-inp..., deepseq
=> base>=4.3 && <4.8)
trying: deepseq-1.3.0.1
next goal: array (dependency of deepseq-1.3.0.1)
rejecting: array-0.5.0.1/installed-inp..., 0.5.0.0 (conflict: deepseq =>
array>=0.1 && <0.5)
rejecting: array-0.4.0.1 (conflict: base==4.8.0.0/installed-inp..., array =>
base>=4.2 && <4.7)
rejecting: array-0.4.0.0 (conflict: base==4.8.0.0/installed-inp..., array =>
base>=4.2 && <4.6)
rejecting: array-0.3.0.3 (conflict: base==4.8.0.0/installed-inp..., array =>
base>=4.2 && <4.5)
rejecting: array-0.3.0.2, 0.3.0.1 (conflict: base==4.8.0.0/installed-inp...,
array => base>=4.2 && <4.4)
rejecting: array-0.3.0.0 (conflict: base==4.8.0.0/installed-inp..., array =>
base>=3 && <4.4)
rejecting: array-0.2.0.0, 0.1.0.0 (conflict: base==4.8.0.0/installed-inp...,
array => base<4.3)
Dependency tree exhaustively searched.

The problem arises from vector requiring deepseq < 1.4 when intree package db contains deepseq 
1.4. Removing the upper bound on deepseq in vector.cabal allows to resolve dependencies but ends 
with a build error:

Data/Vector/Primitive/Mutable.hs:78:10:
    No instance for (GHC.Generics.Generic (MVector s a))
      arising from a use of ‘Control.DeepSeq.$gdmrnf’
    In the expression: Control.DeepSeq.$gdmrnf
    In an equation for ‘rnf’: rnf = Control.DeepSeq.$gdmrnf
    In the instance declaration for ‘NFData (MVector s a)’

Fixing this error (importing GHC.Generics & deriving `Generic` instance for `MVector s a`) leads 
to another one:

Data/Vector/Primitive/Mutable.hs:80:10:
    No instance for (Control.DeepSeq.GNFData (Rep (MVector s a)))
      arising from a use of ‘Control.DeepSeq.$gdmrnf’
    In the expression: Control.DeepSeq.$gdmrnf
    In an equation for ‘rnf’: rnf = Control.DeepSeq.$gdmrnf
    In the instance declaration for ‘NFData (MVector s a)’

This time I have no idea how to fix it since GNFData is an internal class of Control.Deepseq 
module. Help?

Aside: at first I thought vector is one of the boot libraries since it is kept in the source tree. 
But then I realized it is not being build during bootstrapping. Why do we keep it in the source 
tree then?

Janek

---
Politechnika Łódzka
Lodz University of Technology

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