Suppress some Clang warnings about unused return values.

Cast result to (void) where we are intentionally ignoring
the return value.

include/cppcoro/async_generator.hpp

@@ -671,7 +671,7 @@ namespace cppcoro
 			while (it != itEnd)
 			{
 				co_yield std::invoke(func, *it);
-				co_await ++it;
+				(void)co_await ++it;
 			}
 		}
 	}

test/async_generator_tests.cpp

@@ -182,10 +182,10 @@ TEST_CASE("async producer with async consumer"
 	{
 		auto it = co_await producer.begin();
 		CHECK(*it == 1u);
-		co_await ++it;
+		(void)co_await ++it;
 		CHECK(*it == 2u);
 		co_await c1;
-		co_await ++it;
+		(void)co_await ++it;
 		CHECK(it == producer.end());
 	}();
 

test/lazy_task_tests.cpp

@@ -113,7 +113,7 @@ TEST_CASE("lazy_task destructor destroys result")
 
 		[](cppcoro::lazy_task<counted>& t) -> cppcoro::task<>
 		{
-			co_await t;
+			co_await t.when_ready();
 			CHECK(t.is_ready());
 			CHECK(counted::active_count() == 1);
 		}(t);

test/shared_lazy_task_tests.cpp

@@ -73,7 +73,7 @@ TEST_CASE("result is destroyed when last reference is destroyed"
 
 		[](cppcoro::shared_lazy_task<counted> t) -> cppcoro::task<>
 		{
-			co_await t;
+			co_await t.when_ready();
 		}(t);
 
 		CHECK(counted::active_count() == 1);

test/when_all_ready_tests.cpp

@@ -38,7 +38,7 @@ TEST_CASE("when_all_ready() with no args")
 {
 	auto run = []() -> cppcoro::task<>
 	{
-		co_await cppcoro::when_all_ready();
+		(void)co_await cppcoro::when_all_ready();
 	};
 	CHECK(run().is_ready());
 }
@@ -366,7 +366,7 @@ TEST_CASE("when_all_ready() doesn't rethrow exceptions")
 		{
 			auto[t0, t1] = co_await cppcoro::when_all_ready(makeTask(true), makeTask(false));
 
-			CHECK_THROWS_AS(co_await t0, const std::exception&);
+			CHECK_THROWS_AS((void)co_await t0, const std::exception&);
 			CHECK(co_await t1 == 123);
 		}
 		catch (...)