diff --git a/cspell.json b/cspell.json
index dfd3d43d..68d56b75 100644
--- a/cspell.json
+++ b/cspell.json
@@ -43,6 +43,7 @@
     "interner",
     "itertools",
     "ITRS",
+    "kwarg",
     "kwargs",
     "lcons",
     "linearization",
@@ -99,13 +100,6 @@
     "walkdir",
     "wopts"
   ],
-  "files": [
-    "**/*.rs",
-    "**/*.md"
-  ],
-  "ignoreRegExpList": [
-    "HexValues",
-    "/λ/g",
-    "/-O/g"
-  ]
+  "files": ["**/*.rs", "**/*.md"],
+  "ignoreRegExpList": ["HexValues", "/λ/g", "/-O/g"]
 }
diff --git a/src/imp/order_kwargs.rs b/src/imp/order_kwargs.rs
index 43c433f6..1f4a267a 100644
--- a/src/imp/order_kwargs.rs
+++ b/src/imp/order_kwargs.rs
@@ -123,7 +123,7 @@ impl Expr {
             arg.order_kwargs(book)?;
           }
         }
-        _ => {}
+        _ => return Err(format!("Constructor '{name}' not found.")),
       },
       Expr::MapInit { entries } => {
         for entry in entries {