Fixed segmentation fault caused by name reuse (TR# 902064)

Change-Id: I94fe211439f312aa9fa24564b381f8b312e49c7f
Signed-off-by: Botond Baranyi <botond.baranyi@ericsson.com>

compiler2/ttcn3/AST_ttcn3.cc

@@ -4311,6 +4311,7 @@ namespace Ttcn {
   void Def_Template::chk()
   {
     if (checked) return;
+    checked = true;
     Error_Context cntxt(this, "In template definition `%s'",
       id->get_dispname().c_str());
     const string& t_genname = get_genname();
@@ -4350,7 +4351,6 @@ namespace Ttcn {
     }
 
     type->chk_this_template_ref(body);
-    checked = true;
     Type *t = type->get_type_refd_last();
     if (t->get_typetype() == Type::T_PORT) {
       error("Template cannot be defined for port type `%s'",

function_test/Semantic_Analyser/template/TempImp_OK.ttcn

+/******************************************************************************
+ * Copyright (c) 2000-2017 Ericsson Telecom AB
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *   Baranyi, Botond
+ *
+ ******************************************************************************/
+
+module TempImp_OK {
+
+type integer T;
+
+}

function_test/Semantic_Analyser/template/TempNameReuse_SE.ttcn

+/******************************************************************************
+ * Copyright (c) 2000-2017 Ericsson Telecom AB
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *   Baranyi, Botond
+ *
+ ******************************************************************************/
+
+module TempNameReuse_SE { //^In TTCN-3 module//
+
+import from TempImp_OK all;
+
+template T T := 1; //^In template definition// //is not a reference to a type//
+
+}