From 812e478989e27983b8dea7ab11964de751654ba2 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Wed, 4 Jun 2025 13:05:58 -0700
Subject: Make interface types non c-style in Slang2026. (#7260)

* Make interface types non c-style.

* Make Optional<T> work with autodiff and existential types.

* Fix.

* patch behind slang 2026.

* Fix warnings.

* cleanup.

* Fix tests.

* Fix.

* Fix com interface lowering.

* Add comment to test.

* regenerate command line reference

* Add test for passing `none` to autodiff function.

* Fix recording of `getDynamicObjectRTTIBytes`.

* Fix nested Optional types.

---------

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>
---
 .../existential-is-not-c-like.slang                 | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 tests/initializer-list/existential-is-not-c-like.slang

(limited to 'tests/initializer-list')

diff --git a/tests/initializer-list/existential-is-not-c-like.slang b/tests/initializer-list/existential-is-not-c-like.slang
new file mode 100644
index 000000000..1058033c9
--- /dev/null
+++ b/tests/initializer-list/existential-is-not-c-like.slang
@@ -0,0 +1,21 @@
+// Test that in Slang 2026, it is no longer valid to default initialize an existential value.
+#lang 2026
+
+//TEST:SIMPLE(filecheck=CHECK): -target spirv
+interface IBSDF
+{
+    float3 eval(float3 wi, float3 wo);
+}
+
+struct ShaderGraph
+{
+    IBSDF bsdf_stack[8]; // Intentionally uninitialized.
+    int next_bsdf = 0; // must be zero.
+}
+
+[numthreads(1,1,1)]
+void main()
+{
+    // CHECK: ([[# @LINE+1]]): error
+    ShaderGraph sg = {};
+}
\ No newline at end of file
-- 
cgit v1.2.3