-- hacks for FCEUX being dumb.
local _error = error
local _assert = assert
error = function(msg, level)
    if level == nil then level = 1 end
    print()
    print(debug.traceback(msg, 1 + level):gsub("\n", "\r\n"))
    _error(msg, level)
end
assert = function(cond, msg)
    if cond then return cond end
    msg = msg or "nondescript"
    print()
    print(debug.traceback(msg, 2):gsub("\n", "\r\n"))
    _error("assertion failed!")
end

-- be strict about globals.
local mt = getmetatable(_G)
if mt == nil then mt = {} setmetatable(_G, mt) end
function mt.__newindex(t, n, v) error("cannot assign undeclared global '" .. tostring(n) .. "'", 2) end
function mt.__index(t, n) error("cannot use undeclared global '" .. tostring(n) .. "'", 2) end
local function globalize(t) for k, v in pairs(t) do rawset(_G, k, v) end end

return globalize