Fix.

Author: csyonghe

source/slang/slang-check-expr.cpp

@@ -4902,30 +4902,31 @@ Expr* SemanticsExprVisitor::visitMemberExpr(MemberExpr* expr)
     // to swizzle vectors interferes with any chance of looking up
     // members via extension, for vector or scalar types.
     //
-    if (auto baseMatrixType = as<MatrixExpressionType>(baseType))
+    if (auto baseScalarType = as<BasicExpressionType>(baseType))
     {
-        auto swizzle = CheckMatrixSwizzleExpr(
-            expr,
-            baseMatrixType->getElementType(),
-            baseMatrixType->getRowCount(),
-            baseMatrixType->getColumnCount());
+        // Treat scalar like a 1-element vector when swizzling
+        auto swizzle = CheckSwizzleExpr(expr, baseScalarType, 1);
         if (swizzle)
             return swizzle;
     }
-    if (auto baseVecType = as<VectorExpressionType>(baseType))
+    else if (auto baseVecType = as<VectorExpressionType>(baseType))
     {
         auto swizzle =
             CheckSwizzleExpr(expr, baseVecType->getElementType(), baseVecType->getElementCount());
         if (swizzle)
             return swizzle;
     }
-    if (auto baseScalarType = as<BasicExpressionType>(baseType))
+    else if (auto baseMatrixType = as<MatrixExpressionType>(baseType))
     {
-        // Treat scalar like a 1-element vector when swizzling
-        auto swizzle = CheckSwizzleExpr(expr, baseScalarType, 1);
+        auto swizzle = CheckMatrixSwizzleExpr(
+            expr,
+            baseMatrixType->getElementType(),
+            baseMatrixType->getRowCount(),
+            baseMatrixType->getColumnCount());
         if (swizzle)
             return swizzle;
     }
+
     if (as<NamespaceType>(baseType))
     {
         return _lookupStaticMember(expr, expr->baseExpression);