[Cc1.56][Ssp/smp]Cant Backspace/delete Characters After Running My Program

Version Info: 1.56 Client And 1.56 Server
Description of bug: after running my program it seems to break backspacing/deleting characters in the edit program
How To Reproduce: Run this program here http://pastebin.com/q7vk7hdy then do "edit file" and then write some letters and try to backspace

Don't overwrite global variables, specifically the keys table that many programs use to look for things like keys.delete.

Moved to Ask a Pro.

keys is already defined, and you're overwriting it with your own keys table. Rename your keys table to something else.

Or instead of not calling your variable "keys" just make it a local variable. Then it won't overwrite. I'm surprised how uncommon that ever-important "local" keyword is among the code on these forums.

ah, this useless conversation where everybody posts the same way of fixing the overwrite global problem
http://computercraft...i/Category:APIs <- dont overwrite these
this also includes many other built in apis:
http://www.lua.org/manual/5.1/

localization:

bad:

local var=0
for l1=1,100 do
local var=1+var
end

good

local var=0
for l1=1,100 do
var=1+var
end

localized variables only work within their own block and their child blocks
this includes do,for,while,function,etc statements

this is how you localize functions:

local function foo()

same dynamics as variables