neovim/neovim — pull request #1188 by Shougo (2014-09-17 23:00:50+00:00)
Title: vim-patch:7.4.364

Problem: When the viminfo file can't be renamed there is no error message.
(Vladimir Berezhnoy)
Solution: Check for the rename to fail.

https://code.google.com/p/vim/source/detail?r=v7-4-364