Loop table crash

[iiau]

Repro:

for k,v in ipairs,{} do end

[Autterfly]

This is not an issue, that’s how generic for loops work.

for vars in iterator, table, index do

end

Since you used ipairs as your iterator, it was called indefinitely because it returned another iterator function.

Use next instead if you’re going to use this format.

for i, v in next, table do

end

(ipairs returns next, table, nil)

[Tiffblocks]

There is a section in the Lua manual with documentation on how iterators work: Lua 5.1 Reference Manual
It usually only comes up when implementing a new iterator.

Effectively, your code is syntax sugar for the following:

local f, s, var = ipairs, {}, nil -- N.B.
while true do
    var = f(s, var) -- f(s, var) == ipairs({}, nil) == next, {}, nil ; var is set to next
    if var == nil then break end -- never taken, because f always returns next which is not nil
    -- loop body goes here
end