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error: generic parameters may not be used in const operations
--> $DIR/issue-68366.rs:12:37
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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 here, i.e. `N`
= help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
error: `Option<usize>` is forbidden as the type of a const generic parameter
--> $DIR/issue-68366.rs:9:25
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LL | struct Collatz<const N: Option<usize>>;
| ^^^^^^^^^^^^^
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= note: the only supported types are integers, `bool`, and `char`
help: add `#![feature(adt_const_params)]` to the crate attributes to enable more complex and user defined types
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LL + #![feature(adt_const_params)]
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error[E0207]: the const parameter `N` is not constrained by the impl trait, self type, or predicates
--> $DIR/issue-68366.rs:12:7
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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:19:6
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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 4 previous errors
For more information about this error, try `rustc --explain E0207`.
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