src/test/ui/const-generics/issues/issue-68366.min.stderr

   1 error: generic parameters may not be used in const operations
   2   --> $DIR/issue-68366.rs:11:37
   3    |
   4 LL | impl <const N: usize> Collatz<{Some(N)}> {}
   5    |                                     ^ cannot perform const operation using `N`
   6    |
   7    = help: const parameters may only be used as standalone arguments, i.e. `N`
   8    = help: use `#![feature(generic_const_exprs)]` to allow generic const expressions
   9
  10 error[E0207]: the const parameter `N` is not constrained by the impl trait, self type, or predicates
  11   --> $DIR/issue-68366.rs:11:13
  12    |
  13 LL | impl <const N: usize> Collatz<{Some(N)}> {}
  14    |             ^ unconstrained const parameter
  15    |
  16    = note: expressions using a const parameter must map each value to a distinct output value
  17    = note: proving the result of expressions other than the parameter are unique is not supported
  18
  19 error[E0207]: the const parameter `N` is not constrained by the impl trait, self type, or predicates
  20   --> $DIR/issue-68366.rs:17:12
  21    |
  22 LL | impl<const N: usize> Foo {}
  23    |            ^ unconstrained const parameter
  24    |
  25    = note: expressions using a const parameter must map each value to a distinct output value
  26    = note: proving the result of expressions other than the parameter are unique is not supported
  27
  28 error: aborting due to 3 previous errors
  29
  30 For more information about this error, try `rustc --explain E0207`.