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When we encounter a `dyn Trait` that isn't object safe, look for its
implementors. If there's one, mention using it directly If there are
less than 9, mention the possibility of creating a new enum and using
that instead.
Account for object unsafe `impl Trait on dyn Trait {}`. Make a
distinction between public and sealed traits.
Fix #80194.
19 lines
892 B
Plaintext
19 lines
892 B
Plaintext
error[E0038]: the trait `Expr` cannot be made into an object
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--> $DIR/object-safety-issue-22040.rs:12:23
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LL | elements: Vec<Box<dyn Expr + 'x>>,
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| ^^^^^^^^^^^^^ `Expr` cannot be made into an object
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note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
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--> $DIR/object-safety-issue-22040.rs:5:21
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LL | trait Expr: Debug + PartialEq {
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| ---- ^^^^^^^^^ ...because it uses `Self` as a type parameter
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| this trait cannot be made into an object...
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= help: only type `SExpr<'x>` implements the trait, consider using it directly instead
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0038`.
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