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   git-merge    ( 1 )

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PRE-MERGE CHECKS

Before applying outside changes, you should get your own work in
       good shape and committed locally, so it will not be clobbered if
       there are conflicts. See also git-stash(1). git pull and git
       merge will stop without doing anything when local uncommitted
       changes overlap with files that git pull/git merge may need to
       update.

       To avoid recording unrelated changes in the merge commit, git
       pull and git merge will also abort if there are any changes
       registered in the index relative to the HEAD commit. (Special
       narrow exceptions to this rule may exist depending on which merge
       strategy is in use, but generally, the index must match HEAD.)

       If all named commits are already ancestors of HEAD, git merge
       will exit early with the message "Already up to date."