cannot infer table fields when using `setmetatable` with non-literal table argument

[Yuhf7]

Works:

local tt = setmetatable({ foo = 123, bar = 321 }, {})

-- typing `tt.` shows both 'foo' and 'bar' as suggestions
local a = tt.foo -- `a` is integer

Doesn't work:

local t = { foo = 123, bar = 321 }

local tt = setmetatable(t, {})

-- no suggestions show up when typing `tt.`
local a = tt.foo -- `a` is nil because `tt.foo` is unknown

I first came across this when using emmylua_ls with AwesomeWM and requiring the awful module, but it also occurs in simpler cases like the one above.

In AwesomeWM:

local awful = require('awful')

The only field in awful is a function__index() which isn't even valid.