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error[E0049]: method `a` has 1 const parameter but its trait declaration has 0 const parameters
--> $DIR/const-closure-trait-method-fail.rs:5:1
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LL | #[const_trait]
| ^^^^^^^^^^^^^^ found 1 const parameter
LL | trait Tr {
LL | fn a(self) -> i32;
| - expected 0 const parameters
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/const-closure-trait-method-fail.rs:14:39
|
LL | const fn need_const_closure<T: ~const FnOnce(()) -> i32>(x: T) -> i32 {
| ^^^^^^^^^^^^^^^^^
error[E0015]: cannot call non-const closure in constant functions
--> $DIR/const-closure-trait-method-fail.rs:15:5
|
LL | x(())
| ^^^^^
|
= note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: consider further restricting this bound
|
LL | const fn need_const_closure<T: ~const FnOnce(()) -> i32 + ~const FnOnce(())>(x: T) -> i32 {
| +++++++++++++++++++
help: add `#![feature(effects)]` to the crate attributes to enable
|
LL + #![feature(effects)]
|
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0015, E0049.
For more information about an error, try `rustc --explain E0015`.
|
