move PinBox into pin module and export through std

src/test/run-pass/async-await.rs

@@ -12,7 +12,7 @@
 
 #![feature(arbitrary_self_types, async_await, await_macro, futures_api, pin)]
 
-use std::boxed::PinBox;
+use std::pin::PinBox;
 use std::pin::PinMut;
 use std::future::Future;
 use std::sync::{

src/test/run-pass/futures-api.rs

@@ -11,7 +11,7 @@
 #![feature(arbitrary_self_types, futures_api, pin)]
 #![allow(unused)]
 
-use std::boxed::PinBox;
+use std::pin::PinBox;
 use std::future::Future;
 use std::pin::PinMut;
 use std::rc::Rc;

src/test/rustdoc-js/pinbox-new.js

@@ -14,7 +14,7 @@ const QUERY = 'pinbox::new';
 
 const EXPECTED = {
     'others': [
-        { 'path': 'std::boxed::PinBox', 'name': 'new' },
-        { 'path': 'alloc::boxed::PinBox', 'name': 'new' },
+        { 'path': 'std::pin::PinBox', 'name': 'new' },
+        { 'path': 'alloc::pin::PinBox', 'name': 'new' },
     ],
 };

src/test/rustdoc-js/vec-new.js

@@ -14,6 +14,6 @@ const EXPECTED = {
     'others': [
         { 'path': 'std::vec::Vec', 'name': 'new' },
         { 'path': 'std::vec::Vec', 'name': 'ne' },
-        { 'path': 'std::boxed::PinBox', 'name': 'new' },
+        { 'path': 'std::pin::PinBox', 'name': 'new' },
     ],
 };