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error[E0391]: cycle detected when computing type of `Bug::{opaque#0}`
--> $DIR/issue-53092-2.rs:4:18
|
LL | type Bug<T, U> = impl Fn(T) -> U + Copy;
| ^^^^^^^^^^^^^^^^^^^^^^
|
note: ...which requires type-checking `CONST_BUG`...
--> $DIR/issue-53092-2.rs:6:1
|
LL | const CONST_BUG: Bug<u8, ()> = unsafe { std::mem::transmute(|_: u8| ()) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: ...which requires computing layout of `Bug<u8, ()>`...
= note: ...which requires normalizing `Bug<u8, ()>`...
= note: ...which again requires computing type of `Bug::{opaque#0}`, completing the cycle
note: cycle used when checking item types in top-level module
--> $DIR/issue-53092-2.rs:1:1
|
LL | / #![feature(type_alias_impl_trait)]
LL | | #![allow(dead_code)]
LL | |
LL | | type Bug<T, U> = impl Fn(T) -> U + Copy;
... |
LL | | CONST_BUG(0);
LL | | }
| |_^
error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
--> $DIR/issue-53092-2.rs:6:41
|
LL | const CONST_BUG: Bug<u8, ()> = unsafe { std::mem::transmute(|_: u8| ()) };
| ^^^^^^^^^^^^^^^^^^^
|
= note: source type: `[closure@$DIR/issue-53092-2.rs:6:61: 6:68]` (0 bits)
= note: target type: `Bug<u8, ()>` (size can vary because of [type error])
error[E0277]: the trait bound `U: From<T>` is not satisfied
--> $DIR/issue-53092-2.rs:10:5
|
LL | |x| x.into()
| ^^^^^^^^^^^^ the trait `From<T>` is not implemented for `U`
|
note: required by a bound in `make_bug`
--> $DIR/issue-53092-2.rs:9:19
|
LL | fn make_bug<T, U: From<T>>() -> Bug<T, U> {
| ^^^^^^^ required by this bound in `make_bug`
help: consider restricting type parameter `U`
|
LL | type Bug<T, U: std::convert::From<T>> = impl Fn(T) -> U + Copy;
| +++++++++++++++++++++++
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0277, E0391, E0512.
For more information about an error, try `rustc --explain E0277`.
|
