Don't set cpo&vim if we're going to early exit
          #399
        
          
      
                
     Merged
            
            
          
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This was a bad merge that resulted from #393 being opened before #397
but landing after.
If we override the
&cpooption and thenfinish, it will never getset back to the saved cpo.
Instead, let's just only do the
setif we're sure we're not going toearly exit.