unions (untagged)

compiler_tests.odin

@@ -2139,6 +2139,19 @@ yield_compiles_and_runs :: proc(t: ^testing.T) {
 	testing.expect_value(t, state.exit_code, 42)
 }
 
+@(test)
+native_union_compiles_and_runs :: proc(t: ^testing.T) {
+	output := "/tmp/brolang-test-unions"
+	defer _ = os.remove(output)
+	status := compiler_core.compile_package("examples/programs/unions", output)
+	testing.expect_value(t, status, 0)
+	state := run_executable(output)
+	// A native untagged union (`Val :: union { n i32, f f64 }`) constructed via a keyed
+	// literal, stored into a local, and read back through field access reinterprets the
+	// carrier and yields 42 (declaration → construct → store → load → field read).
+	testing.expect_value(t, state.exit_code, 42)
+}
+
 @(test)
 yield_misuse_is_diagnosed :: proc(t: ^testing.T) {
 	// A value block that does not end in `yield`, and a `yield` nested inside an