omnicomplete if (can complete)

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omnicomplete if (can complete)

stillLearningVim
Hello,

Near the bottom of :help popupmenu-keys is this chunk of code:

inoremap <expr> . MayComplete()
func MayComplete()
    if (can complete)
      return ".\<C-X>\<C-O>"
    endif
    return '.'
endfunc


What is an example of (can complete) ?
I would like to get a chunk of code like this working, but am not sure how.

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