with_stat.js:2:1 "with" statement cannot be used in strict mode

with({}) {}

 ^

with_stat.js:2:7 Expected ; but found )

with({}) {}

       ^

repeat_param.js:2:18 strict mode function cannot have duplicate parameter name "x"

function func(x, x) {}

                  ^

repeat_prop.js:2:22 Property "foo" already defined

var obj = { foo: 34, foo: 'hello' };

                      ^