* All unsafe operations exist, but the literal unsafe keyword and its machinery doesn't exist
The latter is how most ostensibly safe languages work. See Haskell's UnsafePerformIO, Swift's UnsafePointer, and Java's JNI for 3 examples off the top of my head.
The former is just a really gimped language that would have been a pain in the neck to implement libraries for (see other replies for examples).
* All unsafe operations don't exist.
* All unsafe operations exist, but the literal unsafe keyword and its machinery doesn't exist
The latter is how most ostensibly safe languages work. See Haskell's UnsafePerformIO, Swift's UnsafePointer, and Java's JNI for 3 examples off the top of my head.
The former is just a really gimped language that would have been a pain in the neck to implement libraries for (see other replies for examples).