commit https://github.com/vim/vim/commit/17a13437c9414a8693369a97f3be2fc8ad48c12e Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jan 24 14:22:10 2016 +0100 patch 7.4.1163 Problem: Expressions "0 + v:true" and "'' . v:true" cause an error. Solution: Return something sensible when using a special variable as a number or as a string. (suggested by Damien)

README_src.txt for version 7.4 of Vim: Vi IMproved.

The source archive contains the files needed to compile Vim on Unix systems.
It is packed for Unix systems (NL line separator).

For more information, see the README.txt file that comes with the runtime
archive (vim-7.4-rt.tar.gz).  To be able to run Vim you MUST get the runtime
archive too!