From d4e72a93e13ab880b2f355fb7fb5d55cf0113c3d Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Wed, 9 Aug 2023 21:52:13 -0700
Subject: Support nested structs in function bodies. (#3078)

---
 source/slang/slang-parser.cpp                      | 19 +++++++++++++++++
 tests/language-feature/struct-in-func.slang        | 24 ++++++++++++++++++++++
 .../struct-in-func.slang.expected.txt              |  1 +
 3 files changed, 44 insertions(+)
 create mode 100644 tests/language-feature/struct-in-func.slang
 create mode 100644 tests/language-feature/struct-in-func.slang.expected.txt

diff --git a/source/slang/slang-parser.cpp b/source/slang/slang-parser.cpp
index 1836fd550..80d14795c 100644
--- a/source/slang/slang-parser.cpp
+++ b/source/slang/slang-parser.cpp
@@ -4581,6 +4581,25 @@ namespace Slang
         Token closingBraceToken;
         while (!AdvanceIfMatch(this, MatchedTokenType::CurlyBraces, &closingBraceToken))
         {
+            if (LookAheadToken("struct"))
+            {
+                auto structDecl = ParseStruct();
+                AddMember(scopeDecl, structDecl);
+                continue;
+            }
+            else if (AdvanceIf(this, "typedef"))
+            {
+                auto typeDefDecl = parseTypeDef(this, nullptr);
+                AddMember(scopeDecl, (Decl*)typeDefDecl);
+                continue;
+            }
+            else if (AdvanceIf(this, "typealias"))
+            {
+                auto typeDefDecl = parseTypeAliasDecl(this, nullptr);
+                AddMember(scopeDecl, (Decl*)typeDefDecl);
+                continue;
+            }
+
             auto stmt = ParseStatement();
             if(stmt)
             {
diff --git a/tests/language-feature/struct-in-func.slang b/tests/language-feature/struct-in-func.slang
new file mode 100644
index 000000000..d3bd046f0
--- /dev/null
+++ b/tests/language-feature/struct-in-func.slang
@@ -0,0 +1,24 @@
+//TEST(compute):COMPARE_COMPUTE: -shaderobj
+//TEST(compute):COMPARE_COMPUTE: -vk -shaderobj
+
+int test(int r)
+{
+    struct Val
+    {
+        int a;
+        int b;
+    }
+    Val a;
+    a.a = 1;
+    a.b = 2;
+    return a.a + a.b;
+}
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
+{
+    outputBuffer[0] = test(dispatchThreadID.x);
+}
diff --git a/tests/language-feature/struct-in-func.slang.expected.txt b/tests/language-feature/struct-in-func.slang.expected.txt
new file mode 100644
index 000000000..e440e5c84
--- /dev/null
+++ b/tests/language-feature/struct-in-func.slang.expected.txt
@@ -0,0 +1 @@
+3
\ No newline at end of file
-- 
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