patch 8.1.0555: crash when last search pat is set but not last substitute pat commit https://github.com/vim/vim/commit/2fb8f684d888ad68b283ba8f9505106b5fb725be Author: Bram Moolenaar <Bram@vim.org> Date: Sat Dec 1 13:14:45 2018 +0100 patch 8.1.0555: crash when last search pat is set but not last substitute pat Problem: Crash when last search pat is set but not last substitute pat. Solution: Do not mix up last search pattern and last subtitute pattern. (closes #3647)

, foo
keyword keyword
all your base 
are belong to vim
1 2 3 4 5 7
'i'   <-- should be 3 ' '
'C'   <-- should be 3 ' '
'a'    <-- should be 4 ' '
'A'<-- should be 0 ' '
'D'   <-- 'D' should be intact
this is a test
this is a test
this is a test
"r"    x<-- should be 'x'
"r"  x  <-- should be '  x  '
[This line should contain only the text between the brackets.]
   v   i   m   <-- should show the name of a noted text editor
    6   .   0   <-- and its version number

a
a
a