error: type parameters must be declared prior to const parameters
  --> $DIR/simple-defaults.rs:8:40
   |
LL | struct FixedOutput<'a, const N: usize, T=u32> {
   |                   ---------------------^----- help: reorder the parameters: lifetimes, then types, then consts: `<'a, T = u32, const N: usize>`

error: aborting due to previous error