Public bug reported:

I am using 16.04 xenial, which the mime-support package 3.59.

The run-mailcap script in the mime-support package contains an unescaped
left brace in the regex statement on line 528.

To be exact, the line that currently reads:

$comm =~ s!%{(.*?)}!$_="'$ENV{$1}'";s/\`//g;s/\'\'//g;$_!ge;

should instead read:

$comm =~ s!%\{(.*?)}!$_="'$ENV{$1}'";s/\`//g;s/\'\'//g;$_!ge;

Because of this issue, run-mailcap displays a warning each time it runs
(although actual functionality is not inhibited)

I took a look at the latest edition of the package, 3.60, and this issue
is fixed in that version. Xenial, however, still uses 3.59. Is this fix
coming to Xenial any time soon?

** Affects: mime-support (Ubuntu)
     Importance: Undecided
         Status: Invalid

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https://bugs.launchpad.net/bugs/1828083

Title:
  run-mailcap script contains deprecated unsescaped left brace

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