patch 8.2.1502: Vim9: can use += with a :let command at script level Commit: https://github.com/vim/vim/commit/122616d9c1b57f1e1f29f1151f8e26d24df9092a Author: Bram Moolenaar <Bram@vim.org> Date: Fri Aug 21 21:32:50 2020 +0200 patch 8.2.1502: Vim9: can use += with a :let command at script level Problem: Vim9: can use += with a :let command at script level. Solution: Give an error.

;gvimdef_ming.def : Declares the module parameters for the DLL.
;The mingw environment doesn't know anything about private declarations
;Hence this is the same file as gvimext.def with private removed

LIBRARY      gvimext
; DESCRIPTION  'Vim Shell Extension build with MinGW'

EXPORTS
    DllCanUnloadNow = DllCanUnloadNow@0
    DllGetClassObject  = DllGetClassObject@12