[WalterBright]

D's only runtime memory safety feature is array bounds checking. (The same as Rust, I believe.) The rest is compile time.

D's compile time memory safety focusses on:

1. @safe and @system code

2. disallowing unsafe pointer operations

3. safe alternatives to pointers

4. controlling escaping of pointers

5. controlling the scope of addresses

[SamReidHughes]

Rust has other runtime memory safety checking, like RefCell.