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It's not always possible to handle this at compile time

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Steve Klabnik 2016-08-25 16:37:43 -04:00 committed by Carol (Nichols || Goulding)
parent 3634c81fc7
commit ad0fcf33a5
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src/ch07-02-unrecoverable-errors-with-panic.md
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@ -41,8 +41,11 @@ fn main() {
We attempt to access the hundredth element of our vector, but it only has three We attempt to access the hundredth element of our vector, but it only has three
elements. In this situation, Rust will panic. Using `[]` is supposed to return elements. In this situation, Rust will panic. Using `[]` is supposed to return
a number. But if you pass it an invalid index, there's no number Rust could a number. But if you pass it an invalid index, there's no number Rust could
return here, it would be wrong. So the only thing that we can do is terminate return here, it would be wrong. In this case, we've typed in a literal, so in
the program. theory, Rust could figure it out. But if our program was different, say, maybe
reading the index from user input, it would not be possible to determine at
compile time if the index was in bounds. So the only thing that we can do is
terminate the program.
Let's try to run it: Let's try to run it: