📝 fix some compile warnings

Author: Xudong-Huang

examples/get_yield.rs

@@ -15,7 +15,7 @@ fn sum(a: u32) -> u32 {
 
 fn main() {
     // we specify the send type is u32
-    let mut s = Gn::<(u32)>::new(|| sum(1));
+    let mut s = Gn::<u32>::new(|| sum(1));
     let mut i = 1u32;
     while !s.is_done() {
         i = s.send(i);

src/gen_impl.rs

@@ -92,7 +92,10 @@ impl<'a, A: Any, T: Any> GeneratorImpl<'a, A, T> {
     /// create a new generator with default stack size
     pub fn init_context(&mut self) {
         unsafe {
-            std::ptr::write(self.context.para.as_mut_ptr(), &mut self.para as &mut dyn Any);
+            std::ptr::write(
+                self.context.para.as_mut_ptr(),
+                &mut self.para as &mut dyn Any,
+            );
             std::ptr::write(self.context.ret.as_mut_ptr(), &mut self.ret as &mut dyn Any);
         }
     }

src/stack/mod.rs

@@ -112,7 +112,7 @@ impl SysStack {
             size = min_stack_size;
         }
 
-        size = (size - 1) & !(page_size - 1);
+        size = (size - 1) & !(page_size.overflowing_sub(1).0);
 
         if let Some(size) = size.checked_add(add) {
             if size <= max_stack_size {