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error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates
--> $DIR/issue-74244.rs:9:6
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LL | impl<T> Allocator for DefaultAllocator {
| ^ unconstrained type parameter
error[E0282]: type annotations needed
--> $DIR/issue-74244.rs:16:13
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LL | fn foo() -> A {
| ^ cannot infer type for type parameter `T`
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0207, E0282.
For more information about an error, try `rustc --explain E0207`.
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