Update boot. Support "precedence" syntax.

Boot.Nemerle.Parser/Descriptors/GrammarDescriptor.n

@@ -21,8 +21,8 @@ namespace Nemerle.Parser
     ///Internal. Do not use.
     public abstract NewParsingErrors() : Internal.ParsingErrors;
 
-    [Accessor]
-    private static _default : GrammarDescriptor = DefaultGrammarDescriptor();
+    public static Default : GrammarDescriptor { get; default DefaultGrammarDescriptor(); }
+
     private class DefaultGrammarDescriptor : GrammarDescriptor
     {
       public override Name : string { get { "DefaultGrammar" } }

Boot.Nemerle.Parser/Descriptors/RuleDescriptor.n

@@ -14,6 +14,6 @@ namespace Nemerle.Parser
     public abstract Name : string { get; }
     public abstract Grammar : GrammarDescriptor { get; }
     public virtual IsStart : bool { get { false } }
-    public virtual Parse(source : SourceSnapshot) : option[Ast] { _ = source; throw NotSupportedException() }
+    public virtual Parse(source : SourceSnapshot) : Ast { _ = source; throw NotSupportedException() }
   }
 }

Boot.Nemerle.Parser/Location.n

@@ -35,7 +35,7 @@ namespace Nemerle.Parser
       this(source, Math.Min(a.StartPos, b.StartPos), Math.Max(a.EndPos, b.EndPos))
     }
 
-    [Accessor] private static default : Location = Location(SourceSnapshot.Default, -1, -1);
+    public static Default : Location { get; default Location(SourceSnapshot.Default, -1, -1) }
 
     public IsEmpty : bool { get { StartPos == EndPos } }
 

Boot.Nemerle.Parser/SourceSnapshot.n

@@ -30,7 +30,7 @@ namespace Nemerle.Parser
       this(text, text, fileIndex, fileName, MakeLineIndexes(text));
     }
 
-    [Accessor] private static default : SourceSnapshot = SourceSnapshot("", -1, "");
+    public static Default : SourceSnapshot { get; default SourceSnapshot("", -1, "") }
 
     public PositionToLineColumn(pos : int) : int * int
     {

Boot.Nemerle.Parser/SpanClass.n

@@ -15,9 +15,8 @@ namespace Nemerle.Parser
     public Name : string { get; }
     public Grammar : GrammarDescriptor { get; }
 
-    [Accessor]
-    private static _default : SpanClass = SpanClass("Default", GrammarDescriptor.Default);
-
+    public static Default : SpanClass { get; default SpanClass("Default", GrammarDescriptor.Default) }
+
     public override ToString() : string { Name }
   }
 }