Latest boo improvements including fix to case 459750

src/Boo.Lang/Runtime/DynamicDispatching/SliceDispatcherFactory.cs

@@ -28,6 +28,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Reflection;
 
 namespace Boo.Lang.Runtime.DynamicDispatching
@@ -115,8 +116,20 @@ private MemberInfo[] ResolveMember()
 		public Dispatcher CreateSetter()
 		{
 			MemberInfo[] candidates = ResolveMember();
-			if (candidates.Length > 1) throw new AmbiguousMatchException(Builtins.join(candidates, ", "));
-			return CreateSetter(candidates[0]);
+			if (candidates.Length == 1) return CreateSetter(candidates[0]);
+			return EmitMethodDispatcher(Setters(candidates));
+		}
+
+		private IEnumerable<MethodInfo> Setters(MemberInfo[] candidates)
+		{
+			foreach (MemberInfo info in candidates)
+			{
+				PropertyInfo p = info as PropertyInfo;
+				if (null == p) continue;
+				MethodInfo setter = p.GetSetMethod(true);
+				if (null == setter) continue;
+				yield return setter;
+			}
 		}
 
 		private Dispatcher CreateSetter(MemberInfo member)

tests/testcases/regression/duck-default-setter-overload.boo

@@ -0,0 +1,24 @@
+[System.Reflection.DefaultMember("Item")]
+class Container:
+	private _value as object
+
+	Item(index as object):
+		get:
+			return _value
+		set:
+			_value = value
+
+	Item(index as string):
+		get:
+			return _value
+		set:
+			_value = value
+
+
+d = Container() as duck
+
+str = "index"
+obj = Object()
+
+d[str] = "the string indexer value"
+d[obj] = "the object indexer value"