···

       
11
       
11
       
 
       
    registered on

     

       
12
       
12
       
 
       
    <link xlink:href="http://hackage.haskell.org/">Hackage</link>, but

     

       
13
       
13
       
 
       
    strangely enough normal Nix package lookups don't seem to discover

     

       
14
       
14
       
-
       
    any of them:

     

       
14
       
14
       
+
       
    any of them, except for the default version of ghc, cabal-install, and stack:

     

       
15
       
15
       
 
       
  </para>

     

       
16
       
16
       
 
       
  <programlisting>

     

       
17
       
17
       
-
       
$ nix-env -qa cabal-install

     

       
18
       
18
       
-
       
error: selector ‘cabal-install’ matches no derivations

     

       
19
       
19
       
-
       


     

       
20
       
20
       
-
       
$ nix-env -i ghc

     

       
21
       
21
       
-
       
error: selector ‘ghc’ matches no derivations

     

       
17
       
17
       
+
       
$ nix-env -i alex

     

       
18
       
18
       
+
       
error: selector ‘alex’ matches no derivations

     

       
19
       
19
       
+
       
$ nix-env -qa ghc

     

       
20
       
20
       
+
       
ghc-7.10.2

     

       
22
       
21
       
 
       
</programlisting>

     

       
23
       
22
       
 
       
  <para>

     

       
24
       
23
       
 
       
    The Haskell package set is not registered in the top-level namespace

     

···

       
135
       
135
       
 
       


     

       
136
       
136
       
 
       
<listitem>

     

       
137
       
137
       
 
       
  <para>

     

       
138
       
138
       
-
       
    Haskell packages can no longer be found by name, i.e. the commands

     

       
139
       
139
       
-
       
    <literal>nix-env -qa cabal-install</literal> and <literal>nix-env -i

     

       
140
       
140
       
-
       
    ghc</literal> will fail, even though we <emphasis>do</emphasis> ship

     

       
141
       
141
       
-
       
    both <literal>cabal-install</literal> and <literal>ghc</literal>.

     

       
138
       
138
       
+
       
    Haskell packages can no longer be found by name, except for

     

       
139
       
139
       
+
       
    <literal>ghc</literal>, <literal>cabal-install</literal>, and

     

       
140
       
140
       
+
       
    <literal>stack</literal>, even though we do package the whole Hackage.

     

       
142
       
141
       
 
       
    The reason for this inconvenience is the sheer size of the Haskell

     

       
143
       
142
       
 
       
    package set: name-based lookups such as these would become much

     

       
144
       
143
       
 
       
    slower than they are today if we'd add the entire Hackage database

     

···

       
3985
       
3985
       
 
       
  haskellPackages = haskell.packages.ghc7102.override {

     

       
3986
       
3986
       
 
       
    overrides = config.haskellPackageOverrides or (self: super: {});

     

       
3987
       
3987
       
 
       
  };

     

       
3988
       
3988
       
+
       
  inherit (haskellPackages) ghc cabal-install stack;

     

       
3988
       
3989
       
 
       


     

       
3989
       
3990
       
 
       
  haxe = callPackage ../development/compilers/haxe {

     

       
3990
       
3991
       
 
       
    inherit (ocamlPackages) camlp4;