Problem: Using freed memory with recursive substitute. Solution: Always make a copy for reg_prev_sub. https://github.com/vim/vim/commit/32acf1f1a72ebb9d8942b9c9d80023bf1bb668ea
Problem: Using freed memory with recursive substitute. Solution: Always make a copy for reg_prev_sub. https://github.com/vim/vim/commit/32acf1f1a72ebb9d8942b9c9d80023bf1bb668ea