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error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/unstable-const-fn-in-libcore.rs:19:39
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LL | const fn unwrap_or_else<F: ~const FnOnce() -> T>(self, f: F) -> T {
| ^^^^^^^^^^^^^
error[E0015]: cannot call non-const closure in constant functions
--> $DIR/unstable-const-fn-in-libcore.rs:24:26
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LL | Opt::None => f(),
| ^^^
|
= note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: consider further restricting this bound
|
LL | const fn unwrap_or_else<F: ~const FnOnce() -> T + ~const FnOnce()>(self, f: F) -> T {
| +++++++++++++++++
help: add `#![feature(effects)]` to the crate attributes to enable
|
LL + #![feature(effects)]
|
error[E0493]: destructor of `F` cannot be evaluated at compile-time
--> $DIR/unstable-const-fn-in-libcore.rs:19:60
|
LL | const fn unwrap_or_else<F: ~const FnOnce() -> T>(self, f: F) -> T {
| ^ the destructor for this type cannot be evaluated in constant functions
...
LL | }
| - value is dropped here
error[E0493]: destructor of `Opt<T>` cannot be evaluated at compile-time
--> $DIR/unstable-const-fn-in-libcore.rs:19:54
|
LL | const fn unwrap_or_else<F: ~const FnOnce() -> T>(self, f: F) -> T {
| ^^^^ the destructor for this type cannot be evaluated in constant functions
...
LL | }
| - value is dropped here
error: aborting due to 4 previous errors
Some errors have detailed explanations: E0015, E0493.
For more information about an error, try `rustc --explain E0015`.
|
