error[E0308]: mismatched types --> $DIR/issue-4968.rs:5:16 | LL | const A: (isize,isize) = (4,2); | ---------------------- constant defined here LL | fn main() { LL | match 42 { A => () } | -- ^ | | | | | expected integer, found `(isize, isize)` | | `A` is interpreted as a constant, not a new binding | | help: introduce a new binding instead: `other_a` | this expression has type `{integer}` | = note: expected type `{integer}` found tuple `(isize, isize)` error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.