Fix ICE when lowering an associatedtype declref from an derived interface. (#3312)

* Fix ICE when lowering an associatedtype declref from an derived interface.

* Fixes.

* Fix test.

* Fix GLSL/SPIRV image subscript swizzle store regression.

* Fix.

---------

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/source/slang/slang-language-server-ast-lookup.cpp b/source/slang/slang-language-server-ast-lookup.cpp
index 6c00312ba..dbdf1ddd0 100644
--- a/source/slang/slang-language-server-ast-lookup.cpp
+++ b/source/slang/slang-language-server-ast-lookup.cpp
@@ -363,7 +363,21 @@ public:
         return false;
     }
 
-    bool visitThisExpr(ThisExpr*) { return false; }
+    bool visitThisExpr(ThisExpr* expr)
+    {
+        static const int thisTokenLength = 4;
+        if (_isLocInRange(
+            context, expr->loc, thisTokenLength))
+        {
+            ASTLookupResult result;
+            result.path = context->nodePath;
+            result.path.add(expr);
+            context->results.add(result);
+            return true;
+        }
+        return false;
+    }
+
     bool visitThisTypeExpr(ThisTypeExpr*) { return false; }
     bool visitAndTypeExpr(AndTypeExpr* expr)
     {