Fix.

source/slang/slang-parser.cpp

@@ -3954,6 +3954,11 @@ static NodeBase* parseSubscriptDecl(Parser* parser, void* /*userData*/)
                 decl->returnType.exp = parser->astBuilder->create<IncompleteExpr>();
             }
 
+            auto funcScope = parser->currentScope;
+            parser->PopScope();
+            maybeParseGenericConstraints(parser, genericParent);
+            parser->PushScope(funcScope);
+
             parseStorageDeclBody(parser, decl);
 
             parser->PopScope();

tests/language-feature/generics/generic-subscript.slang

@@ -0,0 +1,24 @@
+//TEST:COMPARE_COMPUTE(filecheck-buffer=CHECK): -output-using-type
+
+//TEST_INPUT: set output = out ubuffer(data=[0 0 0 0], stride=4)
+RWStructuredBuffer<float> output;
+
+struct Tx
+{
+    float x;
+    __subscript<I>(I index) -> float
+        where I:IInteger
+    {
+        get { return x + index.toInt(); }
+        set { x = newValue;}
+    }
+}
+
+[numthreads(1,1,1)]
+void computeMain()
+{
+    Tx obj;
+    obj[0] = 3.0;
+    // CHECK: 5.0
+    output[0] = obj[2];
+}