Unsafety

Unsafe operations are those that can potentially violate the memory-safety guarantees of Rust’s static semantics.

The following language level features cannot be used in the safe subset of Rust:

• Dereferencing a raw pointer.

• Reading or writing a mutable or external static variable.

• Accessing a field of a union, other than to assign to it.

• Calling an unsafe function (including an intrinsic or foreign function).

• Implementing an unsafe trait.

• Declaring an extern block¹.

• Applying an unsafe attribute to an item.