func foo<T>(type: T.Type) {
    print(T)
}

func bar<T>(baz type: T.Type) {
    print(T)
}

foo(String.self)        // ok
foo(String)             // ok
bar(baz: String.self)   // ok
bar(baz: String)        // error

<REPL Input>:1:5: error: cannot create a single-element tuple with an element label
bar(baz: String)        // error
    ^~~~~
    
<REPL Input>:1:4: error: missing argument label 'baz:' in call
bar(baz: String)        // error
   ^
   baz: