Cache parsing

Source/DafnyCore.Test/DooFileTest.cs

@@ -1,4 +1,6 @@
 using Microsoft.Dafny;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Logging.Abstractions;
 using Tomlyn;
 
 namespace DafnyCore.Test;
@@ -33,7 +35,7 @@ private static Program ParseProgram(string dafnyProgramText, DafnyOptions option
     var rootUri = new Uri(fullFilePath);
     Microsoft.Dafny.Type.ResetScopes();
     var errorReporter = new ConsoleErrorReporter(options);
-    var program = ParseUtils.Parse(dafnyProgramText, rootUri, errorReporter);
+    var program = new ProgramParser().Parse(dafnyProgramText, rootUri, errorReporter);
     Assert.Equal(0, errorReporter.ErrorCount);
     return program;
   }

Source/DafnyCore/AST/BuiltIns.cs

@@ -64,6 +64,9 @@ public static Attributes AxiomAttribute() {
     return new Attributes("axiom", new List<Expression>(), null);
   }
 
+  /// <summary>
+  /// Ensures this instance contains the requested type
+  /// </summary>
   public UserDefinedType ArrayType(int dims, Type arg, bool allowCreationOfNewClass) {
     Contract.Requires(1 <= dims);
     Contract.Requires(arg != null);