[Bug 1813090] Re: bash completions in /usr/share/bash-completion generate unbound variable errors

[Ubuntu Foundations Team Bug Bot]

The attachment "add -g to declare of _xspecs to ensure it stays in the
global scope" seems to be a patch.  If it isn't, please remove the
"patch" flag from the attachment, remove the "patch" tag, and if you are
a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by
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** Tags added: patch

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https://bugs.launchpad.net/bugs/1813090

Title:
  bash completions in /usr/share/bash-completion generate unbound
  variable errors

Status in bash package in Ubuntu:
  New
Status in bash-completion package in Ubuntu:
  New

Bug description:
  After upgrading from Ubuntu 18.04 LTS to 18.04.1 LTS, I get errors
  whenever I attempt to tab-complete anything from an interactive bash
  prompt.

  Tab-completing nothing gives me:

      -bash: _xspecs[$cmd]: unbound variable

  Tab-completing an existing filename gives me:

      -bash: !ref: unbound variable

  I've partially narrowed down the cause to me putting `set -o nounset`
  in my `.bashrc` file, and something in `/usr/share/bash-completion` is
  triggering these unbound variable errors. (That is, the errors go away
  if I remove `set -o nounset` or if I make `/usr/share/bash-
  completion/bash_completion` exit immediately.)

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