gistfile1.lua

function try(f, catch_f, ...)
    local status, exception = pcall(f, unpack(arg))
    if not status then
        catch_f(exception)
    end
end

function foo(a, b)
  return a < b;
end

--Triggers an error
--foo(1, nil);

--Triggers an error, and handles it
--try(foo, function(e) print("CUSTOM ERROR HANDLER! " .. e); end);

--Works just fine
--try(foo, function(e) print("error! " .. e); end, 1, 2);