commit https://github.com/vim/vim/commit/069c1e7fa9f45a665064f7f2c17da84d6a48f544 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Jul 15 21:25:08 2016 +0200 patch 7.4.2044 Problem: filter() and map() either require a string or defining a function. Solution: Support lambda, a short way to define a function that evaluates an expression. (Yasuhiro Matsumoto, Ken Takata)