Hashes the given function.
For non-builtin types this uses the [HASH
] protocol.
Hash stability
The hash is guaranteed to be stable within a single virtual machine invocation, but not across virtual machines. So returning the hash from one and calculating it in another using an identical value is not guaranteed to produce the same hash.
Panics
Panics if we try to generate a hash from an unhashable value.
Examples
use hash;
assert_eq!;