[Nix-dev] Missing descriptions in Nixpkgs

[Ludovic Courtès]

Hello,

I just stumbled upon the following error with Nixpkgs trunk:

  $ nix-env -qa --description \*
  error: in a string concatenation:
  evaluation aborted with the following error message: `Write a description'

(The problem disappears when `--description' is omitted.)  The error
message is very terse, which makes it hard to find out which attribute
lacks a `meta.description'.

Any idea how to fix it, or how to find out which attribute is invalid?

Thanks,
Ludo'.