LuaLS / LuaLS/lua-language-server

The integer addition loop has a bug

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Dominant language
Lua
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Forks
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Description

---@param bag table<integer, integer>
---@return integer
---@nodiscard
local function foo(bag)
local sum = 0
for _, count in pairs(bag) do
sum = sum + count
end
return sum -- bug! sum is unknown
end

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First steps

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Research direction

No file or test is named. Start by reproducing the reported Lua snippet in the language server and trace why the integer type from pairs is not retained for sum; done means the example no longer reports sum as unknown.

Written by the indexing model from the issue text.

Assessment

Tech stack
lua
Domain
devtools
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
42/100

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