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error[E0120]: the Drop trait may only be implemented on structures
--> $DIR/E0117.rs:1:15
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LL | impl Drop for u32 {}
| ^^^ implementing Drop requires a struct
error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
--> $DIR/E0117.rs:1:1
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LL | impl Drop for u32 {}
| ^^^^^^^^^^^^^^^^^ impl doesn't use types inside crate
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= note: the impl does not reference only types defined in this crate
= note: define and implement a trait or new type instead
error: aborting due to 2 previous errors
Some errors occurred: E0117, E0120.
For more information about an error, try `rustc --explain E0117`.
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