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Completion for Lisp Symbols
Completion usually happens in the minibuffer. An exception is
completion for Lisp symbol names, which is available in all buffers.
The command `M-TAB' (`lisp-complete-symbol') takes the partial Lisp
symbol before point to be an abbreviation, and compares it against all
non-trivial Lisp symbols currently known to Emacs. Any additional
characters that they all have in common are inserted at point.
Non-trivial symbols are those that have function definitions, values, or
If there is an open-parenthesis immediately before the beginning of
the partial symbol, only symbols with function definitions are
considered as completions.
If the partial name in the buffer has more than one possible
completion and they have no additional characters in common, a list of
all possible completions is displayed in another window.
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