Function with generic variable return type loses typing after first return

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Linux

What is the issue affecting?

Type Checking

Expected Behaviour

ret2 in the example should be listed as string

Actual Behaviour

ret2 is listed as unknown

Reproduction steps

---@generic T
---@param arg T
---@return T ...
function GenericReturn(arg) end

local ret1, ret2 = GenericReturn("")

Additional Notes

Changing the return type to T|string correctly types the variable return but does not inherit the generic's typing.

Log File

No response

未指定源文件或测试。首先复现 issue 中的 generic return 和 vararg 示例，然后跟踪 Lua language server 的 generic return-type inference 和 type-checking 测试。当 ret2 在不更改 annotation 的情况下被推断为 string，并且有一个覆盖该示例的 regression test 时，即视为完成。