patch 8.1.1591: on error garbage collection may free memory in use commit https://github.com/vim/vim/commit/7d491c425334d9477637372a4ebec64c228c8430 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jun 25 06:28:02 2019 +0200 patch 8.1.1591: on error garbage collection may free memory in use Problem: On error garbage collection may free memory in use. Solution: Reset may_garbage_collect when evaluating expression mapping. Add tests. (Ozaki Kiichi, closes #4579)