https://doc.rust-lang.org/book/ch04-01-what-is-ownership.html rustbook-en/src/ch04-01-what-is-ownership.md
Extra symbol is {
This is probably intentional. After all, “fn main() {” is the first line of every main-function.
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where } ?
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this is untrue, main is allowed to return any type that implements Termination
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Alright… let me amend my statement:
“fn main() {” is the first line of every main-function that the book had contained so far. And thus the first line of every main-function that the book expects you to come up with yourself from that point – at least up to chapter 9 – in order to run the code examples.
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Not part of the quotation.
When you have a passage of natural-language text that quotes some computer code, the author of the natural-language text may choose to quote only a fragment of the code -- not enough to be a complete program, or even a complete expression. And that's perfectly fine. In fact, it is often the best way to write something that achieves the goal of the natural-language text, whatever that is.
In the passage you quoted in your original post, I think the point of writing
we won't include all the
fn main() {code in examples
instead of
we won't include all the
fn main()code in examples
was to emphasize that the {, and the matching but unquoted }, are part of the "boilerplate" that is being omitted from examples below this point, that "you" will have to add manually if you are following along. I might or might not have chosen to do the same, but I don't see anything wrong with it.
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