chore: remove unused code.

CanonSharp.Tests/CombinatorsTests/CombinatorParserTests.cs

@@ -28,7 +28,8 @@ public class CombinatorParserTests : ParserTestsBase
         Parser<char, IEnumerable<char>> parser = Sequence(Token('a'), Token('b'), Token('c'));
         ValidateSuccessfulResult(parser, ['a', 'b', 'c'], "abc");
 
-        parser = Sequence([Token('a'), Token('b'), Token('c')]);
+        IEnumerable<Parser<char, char>> parsers = [Token('a'), Token('b'), Token('c')];
+        parser = Sequence(parsers);
         ValidateSuccessfulResult(parser, ['a', 'b', 'c'], "abc");
     }
 

CanonSharp.Tests/CombinatorsTests/PrimitiveParserTests.cs

@@ -52,6 +52,13 @@ public class PrimitiveParserTests : ParserTestsBase
         ValidateFailedResult(parser, "123");
     }
 
+    [Fact]
+    public void SatisfyFailedTest()
+    {
+        Parser<char, char> parser = Satisfy<char>(char.IsLetter);
+        ValidateFailedResult(parser, "");
+    }
+
     [Fact]
     public void AnyTest()
     {