error[E0308]: mismatched types --> $DIR/const-tup-index-span.rs:3:23 | LL | const TUP: (usize,) = 5usize << 64; | ^^^^^^^^^^^^ expected `(usize,)`, found `usize` | = note: expected tuple `(usize,)` found type `usize` help: use a trailing comma to create a tuple with one element | LL | const TUP: (usize,) = (5usize << 64,); | + ++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0308`.