rust: add doc examples

Author: jwatson0

runtime/rust/src/main.rs

@@ -1,6 +1,29 @@
 use regex::Regex;
 use tungstenite::{Message, connect};
 
+/// This is a doc comment.
+/// See https://doc.rust-lang.org/rustdoc/write-documentation/the-doc-attribute.html
+/// # Examples
+///
+/// ```
+/// /// This example can be tested with `rustdoc --test main.rs`
+/// # let baz = "baz" /// this line will be hidden from the docs
+/// let foo = "foo";
+/// assert_eq!(foo, "foo");
+/// ```
+
+#[doc = r" This is a doc comment."]
+#[doc = include_str!("../README.md")]
+
+/// bar docs
+mod bar {
+    /// the docs for Bar
+    pub struct Bar;
+}
+
+/// This struct is not [Bar]
+pub struct Foo1;
+
 fn main() {
     println!("Hello, world!");