generic in the loop

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?

Annotations, Type Checking

Expected Behaviour

Actual Behaviour

Reproduction steps

---@generic T
---@param t T[]
---@return fun(): { first: integer, second: T }
local function test_function(t)
    local ending = #t
    local begining = 1

    local j = begining

    return function()
        if ending < j then
            return nil
        end

        local i = t[j]

        j = j + 1

        if i then return { first = j - 1, second = i } end
    end
end

---@type integer[]
local test_table = {}

local test_result = test_function(test_table)()

local test1 = test_result.second

for itr in test_function(test_table) do
    local test2 = itr.first;
    local test3 = itr.second;
end

Additional Notes

No response

Log File

No response

Start by running the Lua reproduction in the issue and compare the inferred types with the Expected Behaviour and Actual Behaviour screenshots. Trace the language server's annotation and type-checking entry points for generic functions and iterator returns, then verify that the reported types match the expected result.