Index an enum-value table bug

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Windows

What is the issue affecting?

Type Checking

Expected Behaviour

expected the value type of mapping when index

Actual Behaviour

got an unknown

Reproduction steps

---@enum(key) AttrName
local o = {
    ['hp_max'] = true,
}
local map = {
    ['hp_max'] = 114514,
}
---@param t table<AttrName, number>
local function test(t)
    --[[
        Usage 1: correct
    ]]
    local a = 'hp_max'
    local b = t[a]  -- expected: number, got: number
    print(b)

    --[[
        Usage 2: incorrect
    ]]
    local c = t['hp_max'] -- expected: number, got: unknown
    print(c)

    --[[
        Usage 3: correct
    ]]
    local d = "hp_grow"
    local e = t[d] -- expected: unknown, got: unknown
    print(e)
end
test(map)

Additional Notes

No response

Log File

No response

在 Windows 上使用提供的 Lua 代码片段，在 LuaLS Visual Studio Code 扩展中重现该报告，并检查使用 enum 键进行表索引的类型检查路径。比较三种用法的诊断结果，尤其是字面量索引 'hp_max'。当报告的类型与复现中的预期一致时，即视为完成。