Re: [NoW] Deja vu

["Soni \"They/Them\" L." <fakedme@...>]

On 2019-08-07 8:28 p.m., Egor Skriptunoff wrote:
> t = {}
> for j = 1, 2 do
>    t[j] = function(x) return 2*x end
> end
> print(t[1] == t[2])
>
> Lua 5.1    false
> Lua 5.2    true
> Lua 5.3    true
> Lua 5.4    false
>
> It seems that the equality between function values has returned back 
> to its Lua 5.1 semantics.
>
> 1)
> Why "function values caching" has been removed from Lua 5.4?
>
> 2)
> Could we rely on the fact that in Lua 5.4+ any created function is 
> unique value?

Lua 5.4 has const locals in loops. Each loop iteration gets a new j, 
which is const.

That just means each closure is using a different upvalue, and gets 
closed on each loop iteration. Try calling them!

(Well, I could be wrong, I guess. Correct me if I'm wrong.)