From a083a37ee58dc48d92cf2b844466a295eb3e643e Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Wed, 10 Aug 2022 15:37:19 -0700
Subject: Add `none` literal that is convertible to `Optional`. (#2356)

* Add `none` literal that is convertible to `Optional`.

* Fix cpu code gen.

* Include vk and cpu test for is-as operator test.

* Inline comparison operators.

Co-authored-by: Yong He <yhe@nvidia.com>
---
 source/slang/slang-parser.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'source/slang/slang-parser.cpp')

diff --git a/source/slang/slang-parser.cpp b/source/slang/slang-parser.cpp
index 4baa7211e..7447859c7 100644
--- a/source/slang/slang-parser.cpp
+++ b/source/slang/slang-parser.cpp
@@ -5031,6 +5031,11 @@ namespace Slang
         return parser->astBuilder->create<NullPtrLiteralExpr>();
     }
 
+    static NodeBase* parseNoneExpr(Parser* parser, void* /*userData*/)
+    {
+        return parser->astBuilder->create<NoneLiteralExpr>();
+    }
+
     static NodeBase* parseTryExpr(Parser* parser, void* /*userData*/)
     {
         auto tryExpr = parser->astBuilder->create<TryExpr>();
@@ -6587,6 +6592,7 @@ namespace Slang
         _makeParseExpr("true",  parseTrueExpr),
         _makeParseExpr("false", parseFalseExpr),
         _makeParseExpr("nullptr", parseNullPtrExpr),
+        _makeParseExpr("none", parseNoneExpr),
         _makeParseExpr("try",     parseTryExpr),
         _makeParseExpr("__TaggedUnion", parseTaggedUnionType),
         _makeParseExpr("__jvp", parseJVPDifferentiate)
-- 
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