6c31f6ce12
``` error: `S2<'_>` is forbidden as the type of a const generic parameter --> $DIR/lifetime-in-const-param.rs:5:23 | LL | struct S<'a, const N: S2>(&'a ()); | ^^ | = 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 | LL + #![feature(adt_const_params)] | ``` Fix #55941.
43 lines
1.8 KiB
Plaintext
43 lines
1.8 KiB
Plaintext
error: generic parameters may not be used in const operations
|
|
--> $DIR/issue-68366.rs:12:37
|
|
|
|
|
LL | impl <const N: usize> Collatz<{Some(N)}> {}
|
|
| ^ cannot perform const operation using `N`
|
|
|
|
|
= help: const parameters may only be used as standalone arguments, 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
|
|
|
|
|
LL | struct Collatz<const N: Option<usize>>;
|
|
| ^^^^^^^^^^^^^
|
|
|
|
|
= 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
|
|
|
|
|
LL + #![feature(adt_const_params)]
|
|
|
|
|
|
|
error[E0207]: the const parameter `N` is not constrained by the impl trait, self type, or predicates
|
|
--> $DIR/issue-68366.rs:12:7
|
|
|
|
|
LL | impl <const N: usize> Collatz<{Some(N)}> {}
|
|
| ^^^^^^^^^^^^^^ unconstrained const parameter
|
|
|
|
|
= 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
|
|
|
|
|
LL | impl<const N: usize> Foo {}
|
|
| ^^^^^^^^^^^^^^ unconstrained const parameter
|
|
|
|
|
= 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`.
|