error[E0423]: expected value, found builtin type `u8`
  --> $DIR/unknown-alias-defkind-anonconst-ice-116710.rs:6:43
   |
LL | struct A<const N: u32 = 1, const M: u32 = u8>;
   |                                           ^^ not a value

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0423`.