test index param

src/rougail/annotator/param.py

@@ -87,7 +87,7 @@ class ParamAnnotator:
                 elif param.type == 'index':
                     for target in obj.target:
                         if not self.objectspace.paths.is_follower(target.name.path):
-                            msg = _(f'"{param.type}" parameter cannot be set with target "{target.name}"'
+                            msg = _(f'"{param.type}" parameter cannot be set with target "{target.name.name}"'
                                     f' which is not a follower variable')
                             raise DictConsistencyError(msg, 60, obj.xmlfiles)
                     pass

tests/dictionaries/80no_leadership_index/00-base.xml

@@ -0,0 +1,13 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<rougail>
+    <variables>
+        <variable name="my_variable"/>
+    </variables>
+
+    <constraints>
+        <fill name="calc_val">
+            <param type="index"/>
+            <target>my_variable</target>
+        </fill>
+    </constraints>
+</rougail>