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nix-shell: explain the merging property close to the example

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(cherry picked from commit 10a7f19937)
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Graham Christensen 2018-09-19 12:48:08 -04:00 • committed by Eelco Dolstra
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commit cae9262a6c
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7
doc/manual/command-ref/nix-shell.xml
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@ -317,13 +317,14 @@ while (my $token = $p->get_tag("a")) {
</para>
<para>Finally, the following Haskell script uses a specific branch of
Nixpkgs/NixOS (the 14.12 stable branch):
<para>Finally, using the merging of multiple nix-shell shebangs the
following Haskell script uses a specific branch of Nixpkgs/NixOS (the
18.03 stable branch):
<programlisting><![CDATA[
#! /usr/bin/env nix-shell
#! nix-shell -i runghc -p haskellPackages.ghc haskellPackages.HTTP haskellPackages.tagsoup
#! nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz
#! nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixos-18.03.tar.gz
import Network.HTTP
import Text.HTML.TagSoup