nvim-treesitter/tests/query/highlights/lua/test.lua

local a = { 1, 2, 3, 4, 5 }
--          ^ number      ^ punctuation.bracket
--    ^ variable

local _ = next(a)
--          ^ function.builtin
-- ^ keyword

_ = next(a)
--   ^ function.builtin

next(a)
-- ^ function.builtin