patch 8.2.4253: using freed memory when substitute with function call Commit: https://github.com/vim/vim/commit/37f47958b8a2a44abc60614271d9537e7f14e51a Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jan 29 14:21:51 2022 +0000 patch 8.2.4253: using freed memory when substitute with function call Problem: Using freed memory when substitute uses a recursive function call. Solution: Make a copy of the substitute text.