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Unsafe code was used outside of an unsafe function or block.
Erroneous code example:
```compile_fail,E0133
unsafe fn f() { return; } // This is the unsafe code
fn main() {
f(); // error: call to unsafe function requires unsafe function or block
}
```
Using unsafe functionality is potentially dangerous and disallowed by safety
checks. Examples:
* Dereferencing raw pointers
* Calling functions via FFI
* Calling functions marked unsafe
These safety checks can be relaxed for a section of the code by wrapping the
unsafe instructions with an `unsafe` block. For instance:
```
unsafe fn f() { return; }
fn main() {
unsafe { f(); } // ok!
}
```
See the [unsafe section][unsafe-section] of the Book for more details.
[unsafe-section]: https://doc.rust-lang.org/book/ch19-01-unsafe-rust.html
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