From 29e9cd834951df35bd6a43c6f400c834df09d5cb Mon Sep 17 00:00:00 2001
From: rameel <rameel-b@hotmail.com>
Date: Mon, 28 Sep 2026 17:54:29 +0500
Subject: [PATCH] parsers: prevent invalid casts in Repeat<Unit>

---
 src/Ramstack.Parsing/Parser.Repeat.cs               |  2 +-
 tests/Ramstack.Parsing.Tests/ParsersTests.Repeat.cs | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/Ramstack.Parsing/Parser.Repeat.cs b/src/Ramstack.Parsing/Parser.Repeat.cs
index 6e177c1..b637b4c 100644
--- a/src/Ramstack.Parsing/Parser.Repeat.cs
+++ b/src/Ramstack.Parsing/Parser.Repeat.cs
@@ -132,7 +132,7 @@ public static Parser<List<T>> Repeat<T>(this Parser<T> parser, int min, int max)
         Argument.ThrowIfNegativeOrZero(max);
         Argument.ThrowIfGreaterThan(min, max);
 
-        return parser is ICharClassSupport s
+        return typeof(T) == typeof(char) && parser is ICharClassSupport s
             ? (Parser<List<T>>)(object)CreateRepeatParser(s.GetCharClass(), min, max)
             : new RepeatParser<T>(parser, min, max);
     }
diff --git a/tests/Ramstack.Parsing.Tests/ParsersTests.Repeat.cs b/tests/Ramstack.Parsing.Tests/ParsersTests.Repeat.cs
index 5915027..ff92186 100644
--- a/tests/Ramstack.Parsing.Tests/ParsersTests.Repeat.cs
+++ b/tests/Ramstack.Parsing.Tests/ParsersTests.Repeat.cs
@@ -52,6 +52,19 @@ public void Repeat_5_10_Test()
         Assert.That(parser.Parse("aaaa").Success, Is.False);
     }
 
+    [Test]
+    public void Repeat_UnitCharParser_ReturnsUnitList()
+    {
+        var parser = L('a').Void().Repeat<Unit>(2, 3);
+        var result = parser.Parse("aaaa");
+
+        Assert.That(result.Success, Is.True);
+        Assert.That(result.Value, Is.EqualTo(new Unit[3]));
+        Assert.That(result.Length, Is.EqualTo(3));
+
+        Assert.That(parser.Parse("a").Success, Is.False);
+    }
+
     [Test]
     [SuppressMessage("ReSharper", "InconsistentNaming")]
     public void Repeat_InfiniteLoopPrevention_ZeroLength()