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error[E0038]: the trait `issue_3907::Foo` cannot be made into an object
--> $DIR/issue-3907-2.rs:11:12
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LL | fn bar(_x: Foo) {}
| ^^^ `issue_3907::Foo` 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>
--> $DIR/auxiliary/issue-3907.rs:2:8
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LL | fn bar();
| ^^^ the trait cannot be made into an object because associated function `bar` has no `self` parameter
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0038`.
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