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When I open a C++ file and press C-space to try to select some codes, but it doesn't work now. And there's an error message at the bottom: symbol's function definition is void semantic-mrub-update. How to resolve this problem?

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I assume that your goal is to enable set-mark-command using C-space. The function that is linked to your C-space is traceable to . . . lisp/cedet/semantic/mru-bookmark.el in the source code of a recent version of Emacs Trunk. If you search your configuration files and third-party installed libraries / packages, can you find a reference to a key definition that is linked to C-space and semantic-mrub-update or semantic-mrub-push? That key definition would be a likely suspect . . . –  lawlist Sep 21 '13 at 3:43
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