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Unit tests never need to declare globals, only access them. In the main code base this is handled by including "vim.h". If a file wants to declare globals (in the case of neovim that's only main.c), it #define's EXTERN and includes "vim.h". Otherwise, a file just includes "vim.h" (that's the majority case). Since we want to be able to run unit tests without including "vim.h", we predefine "EXTERN" to mean extern. That way, we don't have to include "vim.h".