3 ms·

this pretty much summarises my opinion - one nitpick - i assume you meant "omit bounds and other checks", not "emit bounds and other checks" which seems to mean

• woodruffw 4y ago
  Yes, thank you! That's an embarrassing typo! (And thanks to the other person as well, who presumably deleted the same comment after seeing yours.)
• zozbot234 4y ago
  Rust does emit bounds and other checks, though. Optimization passes can usually clear some of them away, but you'd need to check the assembly output to be sure.
  • kitd 4y ago
    Yes, that's "omit". "Emit" means "to send out", eg "emit a strange noise", "emit radiation".
    • Shish2k 4y ago
      It is specifically both: - trying to access an arbitrary element in a slice, the compiler will emit bounds checks (`if index > len: panic()`) to avoid an uncontrolled out-of-bounds memory access — https://godbolt.org/z/cbY5ebzvK https://godbolt.org/z/cbY5ebzvK (note how if you comment out the assert, the code barely changes, because the compiler is adding an invisible assert of its own) - if the compiler can infer that `index` will always be less than `len`, then it will omit the bounds check — https://godbolt.org/z/TTashYnjd https://godbolt.org/z/TTashYnjd