I think this fixes#30137. I basically just repeated some details that were scattered around other places in this document, and emphasized that you probably don't want an `extern crate` or `mod` statement to end up inside a function.
The documentation shows this:
[dependencies]
rand="0.3.0"
and says it allows any version compatible with 0.3.0, but then it says, "If we wanted to use only 0.3.0 exactly, we could use `=0.3.0`." That is very easy to misunderstand, so hopefully this PR will help others not to be as confused as me. :-)
I think this fixes#30137. I basically just repeated some details that were scattered around other places in this document, and emphasized that you probably don't want an `extern crate` or `mod` statement to end up inside a function.
* `const`: Add reference to raw pointers
* Change `expr!(...)` etc. examples to use `ident` instead.
*Technically*, it should be `pat`, but that's not how it works in
practice.
* `|`: add reference to closure syntax.
* Closure syntax entry.
* Indexing and slicing entries.
The `f` argument will reference the actual value in the `d` box, not the box in the `bar`'s stack frame.
I am just learning Rust, so I don't know how to explain this well, but just from `f`'s type it is clear that it will be a pointer to an `i32`, not a pointer to a pointer. Some `println!("{:p}", ...)`'s can easily confirm this.
I would actually suggest to remove/simplify this part of the example. This is a subtle issue that can easily confuse people at the early stages of familiarizing with the language. (As I got confused by it. :))
At this point of the book, reader have likely use `cargo new --bin`,
likely 2 times, once if they are lazy. This remind them of the `cargo`
syntax.
I was myself unsure whether it was `cargo create`, `cargo new`, and
whether it would initialize in current working directory or needed a
target.
--
Otherwise thanks, I've been writing rust for a few hours, and likes it so far.
At this point of the book, reader have likely use `cargo new --bin`,
likely 2 times, once if they are lazy. This remind them of the `cargo`
syntax.
I was myself unsure whether it was `cargo create`, `cargo new`, and
whether it would initialize in current working directory or needed a
target.
