error[E0308]: mismatched types --> $DIR/name-clash-nullary.rs:2:7 | LL | let None: isize = 42; //~ ERROR mismatched types | ^^^^ expected isize, found enum `std::option::Option` | = note: expected type `isize` found type `std::option::Option<_>` error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.