diff --git a/Parser.Tests/MLexerGreenTests.cs b/Parser.Tests/MLexerGreenTests.cs
index cca2663..fe3aac1 100644
--- a/Parser.Tests/MLexerGreenTests.cs
+++ b/Parser.Tests/MLexerGreenTests.cs
@@ -15,9 +15,7 @@ namespace Parser.Tests
         }
 
         [Theory]
-#pragma warning disable xUnit1019 // MemberData must reference a member providing a valid data type
         [MemberData(nameof(SingleTokensData))]
-#pragma warning restore xUnit1019 // MemberData must reference a member providing a valid data type
         public void MLexerGreen_Parses_Token(TokenKind kind, string text)
         {
             var tokens = ParseText(text);
@@ -26,9 +24,7 @@ namespace Parser.Tests
         }
 
         [Theory]
-#pragma warning disable xUnit1019 // MemberData must reference a member providing a valid data type
         [MemberData(nameof(PairTokensData))]
-#pragma warning restore xUnit1019 // MemberData must reference a member providing a valid data type
         public void MLexerGreen_Parses_PairOfTokens(TokenKind kind1, string text1, TokenKind kind2, string text2)
         {
             var text = text1 + text2;
@@ -39,9 +35,7 @@ namespace Parser.Tests
         }
 
         [Theory]
-#pragma warning disable xUnit1019 // MemberData must reference a member providing a valid data type
         [MemberData(nameof(PairTokensWithSeparatorData))]
-#pragma warning restore xUnit1019 // MemberData must reference a member providing a valid data type
         public void MLexerGreen_Parses_PairOfTokensWithSeparator(TokenKind kind1, string text1, string separatorText, TokenKind kind2, string text2)
         {
             var text = text1 + separatorText + text2;
@@ -89,8 +83,6 @@ namespace Parser.Tests
                 let text = SyntaxFacts.GetText(kind)
                 where !(text is null)
                 where !(SyntaxFacts.IsUnaryTokenKind(kind)
-                        || SyntaxFacts.IsOpeningToken(kind)
-                        || SyntaxFacts.IsClosingToken(kind)
                         || kind == TokenKind.ApostropheToken)
                 select (kind, text);
 
@@ -254,6 +246,22 @@ namespace Parser.Tests
             {
                 return true;
             }
+
+            if (kind1 == TokenKind.CloseBraceToken && kind2 == TokenKind.StringLiteralToken)
+            {
+                return true;
+            }
+
+            if (kind1 == TokenKind.CloseParenthesisToken && kind2 == TokenKind.StringLiteralToken)
+            {
+                return true;
+            }
+
+            if (kind1 == TokenKind.CloseSquareBracketToken && kind2 == TokenKind.StringLiteralToken)
+            {
+                return true;
+            }
+            
             return false;
         }
         
diff --git a/Parser.Tests/ThereAndBackAgain.cs b/Parser.Tests/ThereAndBackAgain.cs
index c73faf0..782f36f 100644
--- a/Parser.Tests/ThereAndBackAgain.cs
+++ b/Parser.Tests/ThereAndBackAgain.cs
@@ -44,9 +44,7 @@ namespace Parser.Tests
         }
 
         [Theory]
-#pragma warning disable xUnit1019 // MemberData must reference a member providing a valid data type
         [MemberData(nameof(FilesData))]
-#pragma warning restore xUnit1019 // MemberData must reference a member providing a valid data type
         public void TestFile(string fileName)
         {
             var text = File.ReadAllText(fileName);
diff --git a/Parser/Internal/DiagnosticsBag.cs b/Parser/Internal/DiagnosticsBag.cs
index ca0ab3f..1dadf31 100644
--- a/Parser/Internal/DiagnosticsBag.cs
+++ b/Parser/Internal/DiagnosticsBag.cs
@@ -57,6 +57,16 @@ namespace Parser.Internal
             Report($"Unexpected token '{actual}', expected '{expected}'.");
         }
 
+        internal void ReportUnmatchedCloseParenthesis(TextSpan span, TokenKind kind)
+        {
+            Report(span, $"Unmatched close parenthesis '{kind}'.");
+        }
+
+        internal void ReportUnmatchedOpenParenthesisByEndOfFile(TextSpan span)
+        {
+            Report(span, "Unmatched open parenthesis by the end of file.");
+        }
+
         public IEnumerator<Diagnostic> GetEnumerator()
         {
             return _diagnostics.GetEnumerator();
@@ -66,5 +76,6 @@ namespace Parser.Internal
         {
             return GetEnumerator();
         }
+
     }
 }
\ No newline at end of file
diff --git a/Parser/Internal/MLexerGreen.cs b/Parser/Internal/MLexerGreen.cs
index 8ff6352..1537d84 100644
--- a/Parser/Internal/MLexerGreen.cs
+++ b/Parser/Internal/MLexerGreen.cs
@@ -798,19 +798,22 @@ namespace Parser.Internal
                     }
                     else
                     {
-                        throw new ParsingException($"Unmatched \"{tokenInfo.Text}\" at {Window.Position}.");
+                        Diagnostics.ReportUnmatchedCloseParenthesis(
+                            new TextSpan(Window.Position.Offset, 1), tokenInfo.Kind);
                     }
                 }
                 else
                 {
-                    throw new ParsingException($"Unmatched \"{tokenInfo.Text}\" at {Window.Position}.");
+                    Diagnostics.ReportUnmatchedCloseParenthesis(
+                        new TextSpan(Window.Position.Offset, 1), tokenInfo.Kind);
                 }
             }
 
             if (tokenInfo.Kind == TokenKind.EndOfFileToken
                 && TokenStack.Any())
             {
-                throw new ParsingException($"Unmatched \"{TokenStack.Pop()}\" by the end of file.");
+                Diagnostics.ReportUnmatchedOpenParenthesisByEndOfFile(
+                    new TextSpan(Window.Position.Offset, 1));
             }
 
             var result = Create(