New language feature: basic error handling. (#2253)

* New language feature: basic error handling.

* Fix.

* Fix `tryCall` encoding according to code review.

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/examples/heterogeneous-hello-world/main.slang b/examples/heterogeneous-hello-world/main.slang
index 2e65c7149..2a9c1eaf1 100644
--- a/examples/heterogeneous-hello-world/main.slang
+++ b/examples/heterogeneous-hello-world/main.slang
@@ -9,20 +9,18 @@ int MessageBoxA(Ptr<void> hwnd, String text, String caption, uint flags);
 [COM]
 interface IObject
 {
-    int getValue(int value);
+    int getValue(int value) throws int;
 }
 
 [DllImport("test-com")]
 IObject createObject();
 
-public __extern_cpp int main()
+public __extern_cpp void main() throws int
 {
     //writeln("hello world");
     //MessageBoxA(nullptr, "hello world!", "example", 0);
 
     IObject object = createObject();
 
-    int rs = object.getValue(2);
-
-    return 0;
+    int rs = try object.getValue(2);
 }
\ No newline at end of file