patch 8.0.0254: error message of assert functions is sometimes incomplete commit https://github.com/vim/vim/commit/c7b831ca154537505f5a22d01335a86b2e9cb023 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jan 28 18:08:12 2017 +0100 patch 8.0.0254: error message of assert functions is sometimes incomplete Problem: When using an assert function one can either specify a message or get a message about what failed, not both. Solution: Concatenate the error with the message.