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The vim-supertab and vim-taglist package will install plugins into /usr/share/vim/plugins
But the vim's default plugins directory is /usr/share/vim/vim72/plugins.
And the latest vim7.2.116 cannot recogonize the /usr/share/vim/plugins directory.
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Pretty much all vim-plugins have this problem. Note that you have [testing] repo enabled (otherwise you wouldn't have this problem); vim-plugins work fine with the vim in [extra]. In cases like this, you should file a bug report http://bugs.archlinux.org
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