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error[E0277]: the size for values of type `Self` cannot be known at compilation time
--> $DIR/issue-20005.rs:10:49
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LL | trait From<Src> {
| --- required by this bound in `From`
...
LL | ) -> <Dst as From<Self>>::Result where Dst: From<Self> {
| ^^^^^^^^^^ doesn't have a size known at compile-time
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= help: the trait `std::marker::Sized` is not implemented for `Self`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
help: consider further restricting `Self`
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LL | ) -> <Dst as From<Self>>::Result where Dst: From<Self>, Self: std::marker::Sized {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
help: consider relaxing the implicit `Sized` restriction
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LL | trait From<Src: ?Sized> {
| ^^^^^^^^
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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