It would be cool if:
let s = b"hello";
let slc = &s[..100];
worked, and returned a slice of min(s.len(), 100) instead of panicing. This is the behavior I expected coming from Python. 
This is useful for ensuring input is no larger than a certain size.
I’d find that behavior surprising. Also, couldn’t you just write &s[..min(s.len(), 100)], which would be much clearer that nothing magical is going on, and show what exactly you hope the code will do.
Rust likes ergonomics, but not at the cost of magicking away some internal details. Rust tends to be more explicit in these situations.
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