local function add(a,b)
assert(type(a) == "number", "a is not a number")
assert(type(b) == "number", "b is not a number")
return a+b
end
add(10)
lua: temp.lua:3: b is not a number
stack traceback:
[C]: in function 'assert'
temp.lua:3: in local 'add'
temp.lua:7: in main chunk
[C]: in ?