Small improvements to various files

src/crates/lib.md

@@ -2,7 +2,7 @@
 
 Let's create a library, and then see how to link it to another crate.
 
-```rust,editable
+```rust,ignore
 pub fn public_function() {
     println!("called rary's `public_function()`");
 }

src/custom_types/enum.md

@@ -5,9 +5,6 @@ different variants. Any variant which is valid as a `struct` is also valid as
 an `enum`.
 
 ```rust,editable
-// An attribute to hide warnings for unused code.
-#![allow(dead_code)]
-
 // Create an `enum` to classify a web event. Note how both
 // names and type information together specify the variant:
 // `PageLoad != PageUnload` and `KeyPress(char) != Paste(String)`.
@@ -58,9 +55,8 @@ fn main() {
 
 ### See also:
 
-[`attributes`][attributes], [`match`][match], [`fn`][fn], and [`String`][str]
+[`match`][match], [`fn`][fn], and [`String`][str]
 
-[attributes]: attribute.html
 [c_struct]: https://en.wikipedia.org/wiki/Struct_(C_programming_language)
 [match]: flow_control/match.html
 [fn]: fn.html

src/flow_control/match/destructuring/destructure_structures.md

@@ -4,26 +4,26 @@ Similarly, a `struct` can be destructured as shown:
 
 ```rust,editable
 fn main() {
-    struct Foo { x: (u32, u32), y: u32 }
+    struct Foo {
+        x: (u32, u32),
+        y: u32,
+    }
 
-    // destructure members of the struct
+    // Try changing the values in the struct to see what happens
     let foo = Foo { x: (1, 2), y: 3 };
-    let Foo { x: (a, b), y } = foo;
 
-    println!("a = {}, b = {},  y = {} ", a, b, y);
+    match foo {
+        Foo { x: (1, b), y } => println!("First of x is 1, b = {},  y = {} ", b, y),
 
-    // you can destructure structs and rename the variables,
-    // the order is not important
+        // you can destructure structs and rename the variables,
+        // the order is not important
+        Foo { y: 2, x: i } => println!("y is 2, i = {:?}", i),
 
-    let Foo { y: i, x: j } = foo;
-    println!("i = {:?}, j = {:?}", i, j);
-
-    // and you can also ignore some variables:
-    let Foo { y, .. } = foo;
-    println!("y = {}", y);
-
-    // this will give an error: pattern does not mention field `x`
-    // let Foo { y } = foo;
+        // and you can also ignore some variables:
+        Foo { y, .. } => println!("y = {}, we don't care about x", y),
+        // this will give an error: pattern does not mention field `x`
+        //Foo { y } => println!("y = {}", y);
+    }
 }
 ```
 

src/meta/doc.md

@@ -4,7 +4,7 @@ Doc comments are very useful for big projects that require documentation. When
 running [Rustdoc][1], these are the comments that get compiled into
 documentation. They are denoted by a `///`, and support [Markdown][2].
 
-```rust,editable,ignore,mdbook-runnable
+```rust,editable,ignore
 #![crate_name = "doc"]
 
 /// A human being is represented here