From 55aa0f6c9a9052ed604a8b902c788d30b9582713 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=90=D0=BB=D0=B5=D0=BA=D1=81=D0=B0=D0=BD=D0=B4=D1=80=20?=
 =?UTF-8?q?=D0=97=D0=B5=D0=BC=D0=BB=D1=8F=D0=BA?=
 <92867056+AlexanderZemlyak@users.noreply.github.com>
Date: Thu, 9 Apr 2026 09:46:58 +0300
Subject: [PATCH] Add shallow copying of default_value fields in generic
 function instance creation (#3410)

---
 TreeConverter/TreeRealization/base_nodes.cs |  8 ++++++++
 TreeConverter/TreeRealization/generics.cs   | 10 +++++-----
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/TreeConverter/TreeRealization/base_nodes.cs b/TreeConverter/TreeRealization/base_nodes.cs
index c62fb1ced..b2875706a 100644
--- a/TreeConverter/TreeRealization/base_nodes.cs
+++ b/TreeConverter/TreeRealization/base_nodes.cs
@@ -334,6 +334,14 @@ namespace PascalABCCompiler.TreeRealization
 				return this.conversion_type;
 			}
 		}
+
+        /// <summary>
+        /// Возвращает поверхностную копию объекта
+        /// </summary>
+        public expression_node ShallowCopy()
+        {
+            return (expression_node)this.MemberwiseClone();
+        }
 	}
 
     [Serializable]
diff --git a/TreeConverter/TreeRealization/generics.cs b/TreeConverter/TreeRealization/generics.cs
index 17d6193e4..3bfef5fbd 100644
--- a/TreeConverter/TreeRealization/generics.cs
+++ b/TreeConverter/TreeRealization/generics.cs
@@ -2665,15 +2665,15 @@ namespace PascalABCCompiler.TreeRealization
                     generic_convertions.determine_type(par.type, _instance_params, true, orig_gen_params),
                     par.parameter_type, this,
                     (par.parameter_type == SemanticTree.parameter_type.var) ? concrete_parameter_type.cpt_var : concrete_parameter_type.cpt_none,
-                    par.default_value, null);
+                    par.default_value?.ShallowCopy(), null);
                 cpar.inital_value = par.inital_value;
-                cpar.default_value = par.default_value;
                 if (cpar.default_value is default_operator_node)
                     (cpar.default_value as default_operator_node).type = generic_convertions.determine_type(cpar.default_value.type, _instance_params, true, orig_gen_params);
-                else if (cpar.default_value is default_operator_node_as_constant)
+                else if (cpar.default_value is default_operator_node_as_constant def_oper_as_constant)
                 {
-                    (cpar.default_value as default_operator_node_as_constant).type = generic_convertions.determine_type(cpar.default_value.type, _instance_params, true, orig_gen_params);
-                    (cpar.default_value as default_operator_node_as_constant).default_operator.type = (cpar.default_value as default_operator_node_as_constant).type;
+                    def_oper_as_constant.type = generic_convertions.determine_type(cpar.default_value.type, _instance_params, true, orig_gen_params);
+                    def_oper_as_constant.default_operator = (default_operator_node)def_oper_as_constant.default_operator.ShallowCopy(); // ShallowCopy здесь и выше, чтобы не портить исходный тип шаблона EVA 26.03.2026
+                    def_oper_as_constant.default_operator.type = def_oper_as_constant.type;
                 }
                     
                 cpar.intrenal_is_params = par.is_params;