public FieldSpec CreateCallSiteField (FullNamedExpression type, Location loc)
		{
			int index = AnonymousMethodsCounter++;
			Field f = new HoistedField (this, type, Modifiers.PUBLIC | Modifiers.STATIC, "Site" + index.ToString ("X"), null, loc);
			f.Define ();

			AddField (f);
			return f.Spec;
		}

		public Field AddCapturedVariable (string name, TypeSpec type)
		{
			CheckMembersDefined ();

			FullNamedExpression field_type = new TypeExpression (type, Location);
			if (!spec.IsGenericOrParentIsGeneric)
				return AddCompilerGeneratedField (name, field_type);

			const Modifiers mod = Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED;
			Field f = new HoistedField (this, field_type, mod, name, null, Location);
			AddField (f);
			return f;
		}

        public FieldSpec CreateCallSiteField(FullNamedExpression type, Location loc)
        {
            int index = fields == null ? 0 : fields.Count;
            Field f = new HoistedField (this, type, Modifiers.PUBLIC | Modifiers.STATIC, "Site" + index.ToString ("X"), null, loc);
            f.Define ();

            AddField (f);

            var fs = f.Spec;
            if (mutator != null) {
                //
                // Inflate the field, no need to keep it in MemberCache as it's accessed only once
                //
                var inflator = new TypeParameterInflator (this, instance_type, spec.MemberDefinition.TypeParameters, instance_type.TypeArguments);
                fs = (FieldSpec) fs.InflateMember (inflator);
            }

            return fs;
        }