From 1ee1688a70f1c099b24b5d479b4f08e3cf3ae410 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Tue, 19 Mar 2024 18:01:42 -0700
Subject: Fix type checking for constructors in generic interfaces. (#3799)

---
 source/slang/slang-ast-type.cpp |  2 +-
 tests/bugs/gh-3792.slang        | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 tests/bugs/gh-3792.slang

diff --git a/source/slang/slang-ast-type.cpp b/source/slang/slang-ast-type.cpp
index e8d702062..a398e2690 100644
--- a/source/slang/slang-ast-type.cpp
+++ b/source/slang/slang-ast-type.cpp
@@ -108,7 +108,7 @@ Val* DeclRefType::_substituteImplOverride(ASTBuilder* astBuilder, SubstitutionSe
     // If this declref type is a direct reference to ThisType or a Generic parameter,
     // and `subst` provides an argument for it, then we should just return that argument.
     //
-    if (as<DirectDeclRef>(substDeclRef.declRefBase))
+    if (as<DirectDeclRef>(substDeclRef.declRefBase) || as<MemberDeclRef>(substDeclRef.declRefBase))
     {
         if (as<ThisTypeDecl>(substDeclRef.getDecl()))
         {
diff --git a/tests/bugs/gh-3792.slang b/tests/bugs/gh-3792.slang
new file mode 100644
index 000000000..6b6a7451c
--- /dev/null
+++ b/tests/bugs/gh-3792.slang
@@ -0,0 +1,25 @@
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=BUF): -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name outputBuffer
+
+interface From<X> {
+  __init(const X x);
+}
+extension float: From<float> {
+  __init(const float x) { this = x; }
+}
+T test<T : From<float>>(float v)
+{
+    T u;
+    u = T(5.0f);
+    return u;
+}
+
+RWStructuredBuffer<float> outputBuffer;
+[numthreads(1,1,1)]
+void computeMain()
+{
+    float v = test<float>(5.0);
+    //BUF: 5.0
+    outputBuffer[0] = v;
+}
\ No newline at end of file
-- 
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