1 error[E0053]: method `len` has an incompatible type for trait
2 --> $DIR/unsafe-trait-impl.rs:8:5
4 LL | unsafe fn len(&self) -> u32;
5 | ---------------------------- type in trait
7 LL | fn len(&self) -> u32 { *self }
8 | ^^^^^^^^^^^^^^^^^^^^ expected unsafe fn, found normal fn
10 = note: expected fn pointer `unsafe fn(&u32) -> _`
11 found fn pointer `fn(&u32) -> _`
13 error: aborting due to previous error
15 For more information about this error, try `rustc --explain E0053`.