add: Array declaration and variable indexer.

CanonSharp.Tests/ScannerTests/LexicalTokenParserTest.cs

@@ -107,6 +107,7 @@ public class LexicalTokenParserTest : LexicalTestBase
     [Theory]
     [InlineData(123, "123")]
     [InlineData(0, "0")]
+    [InlineData(10, "10..20")]
     public void ConstIntegerTest(int value, string input)
     {
         StringReadState state = new(input);