diff --git a/SyntaxVisitors/YieldVisitors/MarkMethodHasYieldVisitor.cs b/SyntaxVisitors/YieldVisitors/MarkMethodHasYieldVisitor.cs
index 854414bee..1b468e7b9 100644
--- a/SyntaxVisitors/YieldVisitors/MarkMethodHasYieldVisitor.cs
+++ b/SyntaxVisitors/YieldVisitors/MarkMethodHasYieldVisitor.cs
@@ -151,6 +151,13 @@ namespace SyntaxVisitors
             var fh = (pd.proc_header as function_header);
             if (fh == null)
                 throw new SyntaxVisitorError("ONLY_FUNCTIONS_CAN_CONTAIN_YIELDS", pd.proc_header.source_context);
+
+            var ttr = fh.return_type as template_type_reference;
+            if (ttr.name.names.Count == 1 && ttr.name.names[0].name.ToLower() == "ienumerable")
+                fh.return_type = new sequence_type(ttr.params_list.params_list[0]);
+            else if (ttr.name.names.Count == 4 && ttr.name.names[0].name.ToLower() == "system" && ttr.name.names[1].name.ToLower() == "collections" && ttr.name.names[2].name.ToLower() == "generic" && ttr.name.names[3].name.ToLower() == "ienumerable")
+                fh.return_type = new sequence_type(ttr.params_list.params_list[0]);
+
             var seqt = fh.return_type as sequence_type;
             if (seqt == null)
                 throw new SyntaxVisitorError("YIELD_FUNC_MUST_RETURN_SEQUENCE", fh.source_context);
diff --git a/SyntaxVisitors/YieldVisitors/ProcessYieldsCapturedVars.cs b/SyntaxVisitors/YieldVisitors/ProcessYieldsCapturedVars.cs
index 9a546821c..e3b6b36bd 100644
--- a/SyntaxVisitors/YieldVisitors/ProcessYieldsCapturedVars.cs
+++ b/SyntaxVisitors/YieldVisitors/ProcessYieldsCapturedVars.cs
@@ -96,8 +96,8 @@ namespace SyntaxVisitors
             if (fh == null)
                 throw new SyntaxError("Only functions can contain yields", "", pd.proc_header.source_context, pd.proc_header);
             var seqt = fh.return_type as sequence_type;
-            if (seqt == null)
-                throw new SyntaxError("Functions with yields must return sequences", "", fh.return_type.source_context, fh.return_type);
+            /*if (seqt == null)
+                throw new SyntaxError("Functions with yields must return sequences", "", fh.return_type.source_context, fh.return_type);*/
 
             // Теперь на месте функции генерируем класс