enum字段无法正常推断

```lua
---@enum Test1
a = {
    a = 1,
    b = 2,
}
---@enum Test2
b = {
    [a.a] = 11,
    [a.b] = 22,
}

---当不在同一文件中时出现错误
---未定义的属性/字段 `[1]`。EmmyLua(undefined-field)
local num = b[1]

```