Fix experimental::coro compatibility with Apple clang 15.

asio/include/asio/experimental/detail/coro_promise_allocator.hpp

@@ -94,14 +94,14 @@ struct coro_promise_allocator
   allocator_type get_allocator() const {return alloc_;}
 
   template <typename... Args>
-  void* operator new(const std::size_t size, Args & ... args)
+  void* operator new(std::size_t size, Args & ... args)
   {
     return allocate_coroutine(size,
         get_variadic<variadic_first<std::allocator_arg_t,
           std::decay_t<Args>...>() + 1u>(args...));
   }
 
-  void operator delete(void* raw, const std::size_t size)
+  void operator delete(void* raw, std::size_t size)
   {
     deallocate_coroutine<allocator_type>(raw, size);
   }

asio/include/asio/experimental/detail/partial_promise.hpp

@@ -54,12 +54,12 @@ template <typename Allocator>
 struct partial_promise_base
 {
   template <typename Executor, typename Token, typename... Args>
-  void* operator new(const std::size_t size, Executor&, Token& tk, Args&...)
+  void* operator new(std::size_t size, Executor&, Token& tk, Args&...)
   {
     return allocate_coroutine<Allocator>(size, get_associated_allocator(tk));
   }
 
-  void operator delete(void* raw, const std::size_t size)
+  void operator delete(void* raw, std::size_t size)
   {
     deallocate_coroutine<Allocator>(raw, size);
   }

asio/src/tests/unit/experimental/coro/exception.cpp

@@ -61,7 +61,10 @@ asio::experimental::coro<int> throwing_generator(
 
   int i = 0;
   while (i < 3)
-    co_yield last = ++i;
+  {
+    last = ++i;
+    co_yield last;
+  }
 
   throw std::runtime_error("throwing-generator");
 }

asio/src/tests/unit/experimental/coro/simple_test.cpp

@@ -82,7 +82,10 @@ asio::experimental::coro<int> generator_impl(
 
   int i = 0;
   while (true)
-    co_yield last = ++i;
+  {
+    last = ++i;
+    co_yield last;
+  }
 }
 
 asio::awaitable<void> generator_test()