1 Attempted to call something which isn't a function nor a method.
3 Erroneous code examples:
10 X::Entry(); // error: expected function, tuple struct or tuple variant,
15 x(); // error: expected function, tuple struct or tuple variant, found `i32`
18 Only functions and methods can be called using `()`. Example:
21 // We declare a function:
22 fn i_am_a_function() {}