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segfault after disabling a loadable builtin

From: izaberina
Subject: segfault after disabling a loadable builtin
Date: Tue, 07 Jul 2015 22:25:55 +0200
User-agent: mail v14.8.2

The mypid loadable in the examples directory sets a dynamic variable.
Bash segfaults if you reference it after using enable -d enable_mypid.

$ enable -f ./mypid enable_mypid
$ enable_mypid
$ enable -d enable_mypid
$ echo $MYPID
Segmentation fault (core dumped)

enable should keep track of the dynamic variables it sets and unset them
when using dlclose().

xoxo iza

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