Wrong suggestion of using `+ static` instead of `<'static>` for unions

[Dylan-DPC-zz]

Someone had this problem on discord, so creating an issue:

pub union Test<'t> {
    i: &'t i64,
    f: &'t f64,
}
thread_local! {
    static vals: RefCell<HashMap<i32, Vec<Vec<Test>>>> = RefCell::new(HashMap::new());
}

Rust suggests you to:

error[E0106]: missing lifetime specifier

   |
   |     static vals: RefCell<HashMap<i32, Vec<Vec<Test>>>> = RefCell::new(HashMap::new());
   |                                               ^^^^ help: consider giving it a 'static lifetime: `Test + 'static`
   |
   = help: this function's return type contains a borrowed value, but there is no value for it to be 
borrowed from

instead it should suggest to use Test<'static> and not <Test + 'static>

playground link