duplicated local variables with same name

[Jinhua Luo <luajit.io@...>]

Hi All,

The reference says "Notice that each execution of a local statement defines new local variables", however, does it make sense to statements with the same variable name?
Even the lua parser creates new variables, only the last one is visible.
For example,

local val = 1
local val = 1
local val = 1
print(val)

The output from luac is:
0+ params, 5 slots, 1 upvalue, 3 locals, 2 constants, 0 functions
    1    [1]    LOADK        0 -1    ; 1
    2    [2]    LOADK        1 -1    ; 1
    3    [3]    LOADK        2 -1    ; 1
    4    [4]    GETTABUP     3 0 -2    ; _ENV "print"
    5    [4]    MOVE         4 2
    6    [4]    CALL         3 2 1
    7    [4]    RETURN       0 1
The print only sees the last one, while the first two are useless.
So why the parser do not recognize this case and keep only one variable instance? Is there some special consideration?


Regards,
Jinhua Luo