diff --git a/notcl.js b/notcl.js
index 70c3c3a..a7ed44f 100644
--- a/notcl.js
+++ b/notcl.js
@@ -8,9 +8,9 @@
 var Notcl = (() => {
   const { AtLeast, Choose, End, Regex, Sequence, Use } = Peg;
 
-  const InterCommandWhitespace = Regex(/\s+/y);
+  const InterCommandWhitespace = Regex(/\s+/y).expects("whitespace");
 
-  const Comment = Regex(/#.*\n/y);
+  const Comment = Regex(/#.*\n/y).expects("#");
 
   const PreCommand = AtLeast(0, Choose(InterCommandWhitespace, Comment));
 
@@ -23,7 +23,7 @@ var Notcl = (() => {
 
   /** @type {Peg.Pattern<string>} */
   const Brace = Sequence(
-    Regex(/\{/y),
+    Regex(/\{/y).expects("{"),
     AtLeast(
       0,
       Choose(
@@ -31,7 +31,7 @@ var Notcl = (() => {
         Regex(/[^{}]+/y).map(([text]) => text)
       )
     ),
-    Regex(/\}/y)
+    Regex(/\}/y).expects("}")
   ).map(([_left, fragments, _right]) => fragments.join(""));
 
   const Word = Sequence(
@@ -40,7 +40,7 @@ var Notcl = (() => {
       Brace.map((text) => ({ text })),
       BasicWord
     )
-  ).map(([_, word]) => word);
+  ).map(([_padding, word]) => word);
 
   const CommandTerminator = Sequence(
     PreWordWhitespace,