patch 8.1.1897: may free memory twice when out of memory commit https://github.com/vim/vim/commit/f1552d07d715b437d941659479942c2543b02bd4 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Aug 21 12:54:18 2019 +0200 patch 8.1.1897: may free memory twice when out of memory Problem: May free memory twice when out of memory. Solution: Check that backslash_halve_save() returns a different pointer. (Dominique Pelle, closes #4847)