From e2b042bd9721995486f4f0cf96847c02d27908e3 Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Sat, 24 Oct 2026 15:26:23 -0700
Subject: Fix chained comparisons and restore recursion coverage

---
 chapter23/docs/23-grammar.md | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'chapter23/docs/23-grammar.md')

diff --git a/chapter23/docs/23-grammar.md b/chapter23/docs/23-grammar.md
index 1d52d5a6..cd231b08 100644
--- a/chapter23/docs/23-grammar.md
+++ b/chapter23/docs/23-grammar.md
@@ -80,11 +80,16 @@ expression : logicalExpression ('?' assignment (':' assignment)?)? ;
 logicalExpression : bitwiseExpression (('&&' | '||') logicalExpression)? ;
 
 bitwiseExpression
-    : comparisonExpression (('&' | '|' | '^') comparisonExpression)*
+    : equalityExpression (('&' | '|' | '^') equalityExpression)*
     ;
 
+equalityExpression : comparisonExpression (('==' | '!=') comparisonExpression)* ;
+
+// Compare adjacent operands once; stop after the first false comparison.
+// Keep one direction per chain; < and <= (or > and >=) may mix.
 comparisonExpression
-    : shiftExpression (('==' | '!=' | '<' | '<=' | '>' | '>=') shiftExpression)*
+    : shiftExpression (('<' | '<=') shiftExpression)*
+    | shiftExpression (('>' | '>=') shiftExpression)+
     ;
 
 shiftExpression
-- 
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