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