From 57896abc38f56dce27ca9d4642c18f44be8db620 Mon Sep 17 00:00:00 2001
From: John Kåre Alsaker <john.kare.alsaker@gmail.com>
Date: Tue, 20 Mar 2018 00:48:41 +0100
Subject: Make resuming generators unsafe instead of the creation of immovable
 generators. Fixes #47787

---
 .../src/language-features/generators.md              | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

(limited to 'src/doc')

diff --git a/src/doc/unstable-book/src/language-features/generators.md b/src/doc/unstable-book/src/language-features/generators.md
index e8e2132dca2..8e888de90a9 100644
--- a/src/doc/unstable-book/src/language-features/generators.md
+++ b/src/doc/unstable-book/src/language-features/generators.md
@@ -36,11 +36,11 @@ fn main() {
         return "foo"
     };
 
-    match generator.resume() {
+    match unsafe { generator.resume() } {
         GeneratorState::Yielded(1) => {}
         _ => panic!("unexpected value from resume"),
     }
-    match generator.resume() {
+    match unsafe { generator.resume() } {
         GeneratorState::Complete("foo") => {}
         _ => panic!("unexpected value from resume"),
     }
@@ -69,9 +69,9 @@ fn main() {
     };
 
     println!("1");
-    generator.resume();
+    unsafe { generator.resume() };
     println!("3");
-    generator.resume();
+    unsafe { generator.resume() };
     println!("5");
 }
 ```
@@ -92,7 +92,7 @@ The `Generator` trait in `std::ops` currently looks like:
 pub trait Generator {
     type Yield;
     type Return;
-    fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;
+    unsafe fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;
 }
 ```
 
@@ -175,8 +175,8 @@ fn main() {
         return ret
     };
 
-    generator.resume();
-    generator.resume();
+    unsafe { generator.resume() };
+    unsafe { generator.resume() };
 }
 ```
 
@@ -200,7 +200,7 @@ fn main() {
             type Yield = i32;
             type Return = &'static str;
 
-            fn resume(&mut self) -> GeneratorState<i32, &'static str> {
+            unsafe fn resume(&mut self) -> GeneratorState<i32, &'static str> {
                 use std::mem;
                 match mem::replace(self, __Generator::Done) {
                     __Generator::Start(s) => {
@@ -223,8 +223,8 @@ fn main() {
         __Generator::Start(ret)
     };
 
-    generator.resume();
-    generator.resume();
+    unsafe { generator.resume() };
+    unsafe { generator.resume() };
 }
 ```
 
-- 
cgit 1.4.1-3-g733a5