[WIP] Complex variadics #718
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This PR checks for situation where variadic type expansion operator (`T...`) is used in an unexpected place, and can't be handled properly. Users will get a warning about such situations, and the operator will be ignored. This prevents unexpected variadic types such as: ```lua local x --- @type integer... local x1, x2 = x -- ^ EmmyLua thinks `x` is a result of a variadic expansion, -- ^^ ^^ so it infers both `x1` and `x2` as integers. ``` Fix EmmyLuaLs#701
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The main part of implementation is done, I need to test more corner cases, and also make sure that we still properly handle multiple variadics in returns (things like
fun(_: A..., _: B...): B..., A...).Fix #714.