vim bug 1

I was very surprised to find a bug in it.

• Command
  vim
• Version
  6.1
• Fixed
  6.3 (maybe 6.2?)
• Description
  

  You can specify a search with an offset:

  /{pattern}/{offset}<CR> Search forward for the [count]'th occurrence of
                          {pattern} and go |{offset}| lines up or down.
                          (linewise).
  

  And you can omit the /{offset} if you just want the next pattern.
  You can also omit the {pattern} if you want to use the last pattern.
  And finally, you can use these as line searches if you do them from the colon prompt.

  But if you omit them both but leave in the '/' for the offset, and the last pattern can be found, then you'll segfault.

• Reproduce
  Create a vim buffer with:

  This is line one.
  This is line two.
  

  Then do a search for 'two':

  /two

  The go back up to the top.

  :1

  And do the line default search (from the ':' prompt) with no offset

  ://

  Segfault!