Bug#820538: Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in m/%{ <-- HERE (.*?)}/ at /usr/bin/run-mailcap line 528.

[積丹尼 Dan Jacobson]

Package: mime-support
Version: 3.59
Severity: wishlist
File: /usr/bin/run-mailcap

$ xdg-open /tmp
Unescaped left brace in regex is deprecated, passed through in regex; marked by 
<-- HERE in m/%{ <-- HERE (.*?)}/ at /usr/bin/run-mailcap line 528.

By the way,

Error: no "view" mailcap rules found for type "inode/directory"