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)