fix #2457

TestSuite/implicitexplicit14.pas

@@ -0,0 +1,21 @@
+type 
+  TClass = auto class
+    i: integer
+  end;
+
+function operator implicit(i: integer): set of integer; extensionmethod;
+begin
+  Result := [i];
+end;
+
+function operator implicit(i: integer): TClass; extensionmethod;
+begin
+  Result := new TClass(i);
+end;
+
+begin
+  var s: set of integer := 2;
+  assert(s = [2]);
+  var o: TClass := 2;
+  assert(o.i = 2);
+end.

TreeConverter/NetWrappers/NetHelper.cs

@@ -1070,7 +1070,7 @@ namespace PascalABCCompiler.NetHelper
         }
 
         private static function_node get_conversion(compiled_type_node in_type,compiled_type_node from,
-            compiled_type_node to,string op_name, NetTypeScope scope)
+            type_node to, string op_name, NetTypeScope scope)
         {
             //MethodInfo[] mia = in_type.compiled_type.GetMethods();
             List<MemberInfo> mia = GetMembers(in_type.compiled_type, op_name);
@@ -1079,8 +1079,10 @@ namespace PascalABCCompiler.NetHelper
             {
                 if (!(mbi is MethodInfo))
                     continue;
+                if (!(to is compiled_type_node))
+                    continue;
                 MethodInfo mi = mbi as MethodInfo;
-                if (mi.ReturnType != to.compiled_type)
+                if (mi.ReturnType != (to as compiled_type_node).compiled_type)
                 {
                     continue;
                 }
@@ -1118,7 +1120,7 @@ namespace PascalABCCompiler.NetHelper
         }
 
         public static function_node get_implicit_conversion(compiled_type_node in_type, compiled_type_node from,
-            compiled_type_node to, NetTypeScope scope)
+            type_node to, NetTypeScope scope)
         {
             return get_conversion(in_type, from, to, compiler_string_consts.implicit_operator_name, scope);
         }

TreeConverter/TreeRealization/types.cs

@@ -3683,19 +3683,16 @@ namespace PascalABCCompiler.TreeRealization
         {
             // То есть получается, что конвертировать откомпилированный тип в неоткомпилированный нельзя несмотря на то что есть extension оператор
             var cctn = ctn as compiled_type_node;
-            if (cctn == null)
+            
-            {
-                return null;
-            }
             function_node fn = null;
-            if (!_implicit_convertions_to.TryGetValue(cctn, out fn))
+            if (!_implicit_convertions_to.TryGetValue(ctn, out fn))
             {
-                fn = NetHelper.NetHelper.get_implicit_conversion(this, this, cctn, scope);
+                fn = NetHelper.NetHelper.get_implicit_conversion(this, this, ctn, scope);
                 if (fn is compiled_function_node)
-                    _implicit_convertions_to.Add(cctn, fn);
+                    _implicit_convertions_to.Add(ctn, fn);
                 else if (fn == null && this.type_special_kind == SemanticTree.type_special_kind.array_kind && this.base_type.Scope != null)
                 {
-                    fn = NetHelper.NetHelper.get_implicit_conversion(this.base_type as compiled_type_node, this.base_type as compiled_type_node, cctn, this.base_type.Scope as NetHelper.NetTypeScope);
+                    fn = NetHelper.NetHelper.get_implicit_conversion(this.base_type as compiled_type_node, this.base_type as compiled_type_node, ctn, this.base_type.Scope as NetHelper.NetTypeScope);
                     if (fn != null)
                     {
                         List<type_node> instance_params = new List<type_node>();
@@ -3704,7 +3701,7 @@ namespace PascalABCCompiler.TreeRealization
                         return fn;
                     }
                 }
-                else if (fn == null && (this.is_generic_type_instance || cctn.is_generic_type_instance))
+                else if (fn == null && cctn != null && (this.is_generic_type_instance || cctn.is_generic_type_instance))
                 {
                     List<type_node> instance_params1 = this.instance_params;
                     List<type_node> instance_params2 = cctn.instance_params;