1 error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
4 LL | impl Drop for u32 {}
7 | | `u32` is not defined in the current crate
8 | impl doesn't use only types from inside the current crate
10 = note: define and implement a trait or new type instead
12 error[E0120]: the `Drop` trait may only be implemented for structs, enums, and unions
13 --> $DIR/E0117.rs:1:15
15 LL | impl Drop for u32 {}
16 | ^^^ must be a struct, enum, or union
18 error: aborting due to 2 previous errors
20 Some errors have detailed explanations: E0117, E0120.
21 For more information about an error, try `rustc --explain E0117`.