diff --git a/tree_sitter_v/test/corpus/for_statement.txt b/tree_sitter_v/test/corpus/for_statement.txt
index e18f1512..4f3b8ce0 100644
--- a/tree_sitter_v/test/corpus/for_statement.txt
+++ b/tree_sitter_v/test/corpus/for_statement.txt
@@ -63,24 +63,38 @@ for v is a {
 
 (source_file
   (for_statement
-    (is_expression
-      (reference_expression
-        (identifier))
-      (plain_type
-        (type_reference_expression
-          (identifier))))
+    (is_clause
+      (is_expression
+        (reference_expression
+          (identifier))
+        (plain_type
+          (type_reference_expression
+            (identifier)))))
     (block)))
 
 ================================================================================
 Simple for mut is statement
 ================================================================================
-for mut v is a {
+for mut v is Foo {
+}
+for mut v !is Bar {
 }
 --------------------------------------------------------------------------------
 
 (source_file
   (for_statement
-    (mut_is_clause
+    (is_clause
+      (mutability_modifiers)
+      (is_expression
+        (reference_expression
+          (identifier))
+        (plain_type
+          (type_reference_expression
+            (identifier)))))
+    (block))
+  (for_statement
+    (is_clause
+      (mutability_modifiers)
       (is_expression
         (reference_expression
           (identifier))