patch 8.0.1599: no error message when gdb does not support debugger commit https://github.com/vim/vim/commit/3e4b84d0b55936ac017d20df6651ddd05e38f58f Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 11 20:51:52 2018 +0100 patch 8.0.1599: no error message when gdb does not support debugger Problem: No error message when gdb does not support the terminal debugger. Solution: Check for the response to open the Machine Interface.