diff --git a/except.hpp b/except.hpp
index e479d72..7bfe437 100644
--- a/except.hpp
+++ b/except.hpp
@@ -51,16 +51,17 @@ namespace cruft::vk {
         static auto
         try_func (FuncT &&func, Args &&...args)
         {
-            if constexpr (std::is_same_v<
-                              typename func_traits<FuncT>::return_type,
-                              VkResult
-                          >)
-            {
+            constexpr bool returns_vkresult = std::is_same_v<
+                typename func_traits<FuncT>::return_type,
+                VkResult
+            >;
+
+            if constexpr (returns_vkresult) {
                 try_code (func (maybe_native (args)...));
                 return;
-            }
-            else
+            } else {
                 return func (maybe_native (args)...);
+            }
         }
 
 
diff --git a/tools/hello.cpp b/tools/hello.cpp
index 3012d94..060d23f 100644
--- a/tools/hello.cpp
+++ b/tools/hello.cpp
@@ -19,6 +19,7 @@
 #include <GLFW/glfw3.h>
 #include <GLFW/glfw3native.h>
 
+#include <cruft/util/cast.hpp>
 #include <cruft/util/extent.hpp>
 #include <cruft/util/io.hpp>
 #include <cruft/util/log.hpp>
@@ -355,13 +356,13 @@ main (void)
     auto queues = pdevice.queue_families ();
     int graphics_queue_id = -1, present_queue_id = -1;
 
-    for (size_t i = 0, last = queues.size (); i != last; ++i)
+    for (int i = 0, last = util::cast::lossless<int> (queues.size ()); i != last; ++i)
         if (queues[i].queueCount > 0 && queues[i].queueFlags & VK_QUEUE_GRAPHICS_BIT) {
             graphics_queue_id = i;
             break;
         }
 
-    for (size_t i = 0, last = queues.size (); i != last; ++i) {
+    for (uint32_t i = 0, last = util::cast::narrow<uint32_t> (queues.size ()); i != last; ++i) {
         if (cruft::vk::error::try_query (vkGetPhysicalDeviceSurfaceSupportKHR,
                                          pdevice.native (), i, surface)) {
             present_queue_id = i;
@@ -732,7 +733,6 @@ main (void)
         ldevice, VK_NULL_HANDLE, 1, &pipeline_info, nullptr
     );
 
-
     //-------------------------------------------------------------------------
     using framebuffer_ptr = cruft::vk::owned_ptr<cruft::vk::framebuffer>;
     std::vector<framebuffer_ptr> swapchain_framebuffers;
@@ -880,6 +880,5 @@ main (void)
     }
 
     cruft::vk::error::try_func (vkDeviceWaitIdle, ldevice.native ());
-
     LOG_INFO ("terminating");
 }
\ No newline at end of file