Remove macro_use and extern crate in doc tests
diff --git a/src/lib.rs b/src/lib.rs
index 0209fb8..b32d67c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -76,13 +76,12 @@
//! ```
//!
//! ```rust
-//! extern crate proc_macro;
-//! extern crate syn;
-//!
-//! #[macro_use]
-//! extern crate quote;
-//!
+//! # extern crate proc_macro;
+//! # extern crate quote;
+//! # extern crate syn;
+//! #
//! use proc_macro::TokenStream;
+//! use quote::quote;
//! use syn::DeriveInput;
//!
//! # const IGNORE_TOKENS: &str = stringify! {
@@ -622,14 +621,12 @@
/// # Examples
///
/// ```rust
-/// extern crate proc_macro;
+/// # extern crate proc_macro;
+/// # extern crate quote;
+/// # extern crate syn;
+/// #
/// use proc_macro::TokenStream;
-///
-/// extern crate syn;
-///
-/// #[macro_use]
-/// extern crate quote;
-///
+/// use quote::quote;
/// use syn::DeriveInput;
///
/// # const IGNORE_TOKENS: &str = stringify! {
@@ -688,12 +685,10 @@
/// # Examples
///
/// ```rust
-/// extern crate syn;
+/// # extern crate syn;
/// #
-/// #
-/// # type Result<T> = std::result::Result<T, Box<std::error::Error>>;
-///
/// use syn::Expr;
+/// use syn::parse::Result;
///
/// fn run() -> Result<()> {
/// let code = "assert_eq!(u8::max_value(), 255)";
@@ -725,15 +720,13 @@
/// # Examples
///
/// ```rust,no_run
-/// extern crate syn;
+/// # extern crate syn;
/// #
-/// #
-/// # type Result<T> = std::result::Result<T, Box<std::error::Error>>;
-///
+/// use std::error::Error;
/// use std::fs::File;
/// use std::io::Read;
///
-/// fn run() -> Result<()> {
+/// fn run() -> Result<(), Box<Error>> {
/// let mut file = File::open("path/to/code.rs")?;
/// let mut content = String::new();
/// file.read_to_string(&mut content)?;