include error explicitly in doctests

Avoid using "pub use", which results in warnings about unused imports.  It is
easy enough to include all that is needed.

Signed-off-by: Paolo Bonzini <[email protected]>

Author: bonzini

examples/linked_list.rs

@@ -10,7 +10,7 @@ use core::{
 
 use pinned_init::*;
 mod error;
-pub use error::Error;
+use error::Error;
 
 #[pin_data(PinnedDrop)]
 #[repr(C)]

examples/mutex.rs

@@ -17,7 +17,6 @@ use pinned_init::*;
 #[allow(unused_attributes)]
 #[path = "./linked_list.rs"]
 pub mod linked_list;
-pub use linked_list::Error;
 use linked_list::*;
 
 pub struct SpinLock {

src/lib.rs

@@ -125,6 +125,7 @@
 //! # #![allow(clippy::disallowed_names)]
 //! # #![feature(allocator_api)]
 //! # use pinned_init::*;
+//! # #[path = "../examples/error.rs"] mod error; use error::Error;
 //! # #[path = "../examples/mutex.rs"] mod mutex; use mutex::*;
 //! #[pin_data]
 //! struct DriverData {
@@ -331,6 +332,7 @@ macro_rules! stack_pin_init {
 /// ```rust
 /// # #![allow(clippy::disallowed_names)]
 /// # #![feature(allocator_api)]
+/// # #[path = "../examples/error.rs"] mod error; use error::Error;
 /// # #[path = "../examples/mutex.rs"] mod mutex; use mutex::*;
 /// # use pinned_init::*;
 /// #[pin_data]
@@ -357,6 +359,7 @@ macro_rules! stack_pin_init {
 /// ```rust
 /// # #![allow(clippy::disallowed_names)]
 /// # #![feature(allocator_api)]
+/// # #[path = "../examples/error.rs"] mod error; use error::Error;
 /// # #[path = "../examples/mutex.rs"] mod mutex; use mutex::*;
 /// # use pinned_init::*;
 /// #[pin_data]
@@ -671,6 +674,7 @@ macro_rules! try_pin_init {
 ///
 /// ```rust
 /// # #![feature(allocator_api)]
+/// # #[path = "../examples/error.rs"] mod error; use error::Error;
 /// # #[path = "../examples/mutex.rs"] mod mutex; use mutex::*;
 /// use pinned_init::*;
 /// struct BigBuf {