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[Smylers <S.Ubuntu@xxxxxxxxxxx>]

Intentional temporary regression: http://lists.gnu.org/archive/html/bug-
bash/2014-09/msg00256.html

Sounds like an upstream fix will be forthcoming.

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https://bugs.launchpad.net/bugs/1376688

Title:
  Punctuation-only functions give error messages in subshells

Status in “bash” package in Ubuntu:
  New

Bug description:
  I have Bash functions defined with punctuation-only names, such as -
  and .., which now give errors when starting nested shells.

  After a recent Shellshock patch, env shows these functions as having
  names like BASH_FUNC_-(), and starting a second Bash in some way, such
  as running a shell script, yields error messages like:

    bash: error importing function definition for `BASH_FUNC_-'

  With a double-nested Bash, each error message is displayed twice.

  So far as I can tell the error message is spurious: the action
  function - is being imported correctly. But it's irritating to have
  the terminal clogged up with these messages, especially when just
  running utilities which I didn't even know were written in Bash.

  This is with bash 4.3-7ubuntu1.4.

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