bug fix #2104

NETGenerator/NETGenerator.cs

@@ -6741,6 +6741,9 @@ namespace PascalABCCompiler.NETGenerator
             else
             {
                 TypeInfo ti = helper.GetTypeReference(value.return_value_type);
+                if (ti == null && value.return_value_type.name == null)//not used lambda, ignore
+                    ret_type = TypeFactory.VoidType;
+                else
                     ret_type = ti.tp;
                 if (IsNeedCorrectGetType(cur_ti, ret_type))
                 {

TestSuite/lambda_delegate.pas

@@ -0,0 +1,12 @@
+procedure p0(l: System.Delegate) := l.DynamicInvoke();
+
+begin
+  var i := 0;
+  p0(()->
+  begin
+    i := 2;  
+    Result := true;
+    
+  end);
+  assert(i = 2);
+end.