minor fix

Author: cfsamson

ch10/b-coroutines-references/src/main.rs

@@ -114,7 +114,8 @@ impl Future for Coroutine0 {
                             // ---------------------------------
                             self.state = State0::Resolved;
 
-                            // Save stack (all variables set to None already)
+                            // Save stack / free resources
+                            let _ = self.stack.buffer.take();
 
                             break PollState::Ready(String::new());
                         }

ch10/c-coroutines-problem/src/main.rs

@@ -115,7 +115,8 @@ impl Future for Coroutine0 {
                             // ---------------------------------
                             self.state = State0::Resolved;
 
-                            // Save stack (all variables set to None already)
+                            // Save stack / free resources
+                            let _ = self.stack.buffer.take();
 
                             break PollState::Ready(String::new());
                         }

ch10/e-coroutines-pin/src/main.rs

@@ -118,7 +118,8 @@ impl Future for Coroutine0 {
                             // ---------------------------------
                             this.state = State0::Resolved;
 
-                            // Save stack (all variables set to None already)
+                            // Save stack / free resources
+                            let _ = this.stack.buffer.take();
 
                             break PollState::Ready(String::new());
                         }