Unexpected generic behaviour

還沒有人認領這個 Issue。

### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

MacOS

### What is the issue affecting?

Annotations

### Expected Behaviour

```lua
local ffi = require("ffi")

---@generic T
---@param ct `T`
---@return fun(x: T): `T`*
local function ref(ct)
return function (init)
return ffi.new(ct.."[1]", {init})
end
end

ffi.cdef [[
typedef struct MyStruct {
int a, b;
} MyStruct;
]]

---@class MyStruct
---@field a integer
---@field b integer

---@class MyStruct* : { [integer] : MyStruct }, ffi.cdata*

local x = ffi.ref "MyStruct" {
a = 4,
b = 2
}

--type of `x` expected to be `MyStruct*`
```

### Actual Behaviour

type of `x` is `MyStruct`

### Reproduction steps

Run the code and check types

### Additional Notes

_No response_

### Log File

_No response_

在 Visual Studio Code 擴充功能中重現註解範例，並檢查泛型回傳型別和 FFI 類別註解是如何推論的。將 x 的推論型別與預期的 MyStruct* 結果進行比較；當範例將 x 回報為 MyStruct* 而不是 MyStruct 時即表示完成。

由索引模型根據 Issue 內容生成。