求助帖 遇到一个问题

#!/usr/local/bin/lua
function list_print(reserve)
for k,v in pairs(reserve) do
print(k)
for m,n in pairs(reserve[k]) do
print(m)
print(n)
end
end
end
function Set(list)
local first={}
local second={true,0}
for _,v in pairs(list) do
first[v]=second
end
return first
end
function count_add(list,word)
local l=list
l[word][2]=l[word][2]+1
return l
end
reserve=Set{"while","end","function",}
--reserve={["while"]={[1]=true,[2]=0},["end"]={[1]=true,[2]=0},["function"]={[1]=true,[2]=0},}
manage=true
while(manage) do
word=io.read()
if (word=="list") then
list_print(reserve)
elseif (word=="out") then
manage=false
elseif (reserve[word]) then
print(word.."是标识符")
reserve=count_add(reserve,word)
else
print(word.."不是标识符")
end
end

我只想修改table内的单个值，但是全部都被修改了