error[E0118]: no base type found for inherent implementation
  --> $DIR/E0118.rs:11:6
   |
LL | impl (u8, u8) { //~ ERROR E0118
   |      ^^^^^^^^ impl requires a base type
   |
   = note: either implement a trait on it or create a newtype to wrap it instead

error: aborting due to previous error

If you want more information on this error, try using "rustc --explain E0118"