fixes

examples/issue-0016.sx

@@ -0,0 +1,17 @@
+// issue-0016: C calling convention for function pointers passed to foreign callbacks.
+//
+// `callconv(.c)` ensures the function uses C ABI, so it can be safely
+// passed as a callback to #foreign functions like SDL_AddEventWatch.
+
+#import "modules/std.sx";
+
+// A function with C calling convention
+add_c :: (a: s64, b: s64) -> s64 callconv(.c) {
+    a + b;
+}
+
+main :: () {
+    // Call it directly — should work like any other function
+    result := add_c(10, 32);
+    print("callconv(.c): {}\n", result);
+}