bug#29858: guix import hackage monadplus fails with a syntax error.

[Alex ter Weele]

Here is what I tried:

  $ guix import hackage monadplus
  Syntax error: unexpected end of input
  guix import: error: failed to download cabal file for package 'monadplus'

I also tried manually downloading the cabal file and importing that:

  $ guix import hackage -s < ~/Downloads/monadplus.cabal
  Syntax error: unexpected end of input
  guix import: error: failed to import cabal file from standard input