structurizr-dsl: Removes deprecated !ref and !extend keywords.

Author: simonbrowndotje

changelog.md

@@ -8,6 +8,7 @@
 - structurizr-dsl: Adds a reluctant version of `include *` (`include *?`) for system context views that only adds relationships to/from the scoped software system.
 - structurizr-dsl: Adds a reluctant version of `include *` (`include *?`) for container views that only adds relationships to/from the containers in the scoped software system.
 - structurizr-dsl: Adds a reluctant version of `include *` (`include *?`) for component views that only adds relationships to/from the components in the scoped container.
+- structurizr-dsl: Removes deprecated `!ref` and `!extend` keywords.
 
 ## 3.2.1 (10th December 2024)
 

structurizr-dsl/src/main/java/com/structurizr/dsl/StructurizrDslParser.java

@@ -361,11 +361,9 @@ void parse(List<String> lines, File dslFile, boolean fragment, boolean includeIn
                         ModelItem modelItem = null;
 
                         if (REF_TOKEN.equalsIgnoreCase(firstToken)) {
-                            log.warn(REF_TOKEN + " has been deprecated and will be removed in a future release - please use !element or !relationship instead");
-                            modelItem = new RefParser().parse(getContext(), tokens.withoutContextStartToken());
+                            throw new RuntimeException(REF_TOKEN + " was previously deprecated, and has now been removed - please use " + FIND_ELEMENT_TOKEN + " or " + FIND_RELATIONSHIP_TOKEN + " instead");
                         } else if (EXTEND_TOKEN.equalsIgnoreCase(firstToken)) {
-                            log.warn(EXTEND_TOKEN + " has been deprecated and will be removed in a future release - please use !element or !relationship instead");
-                            modelItem = new RefParser().parse(getContext(), tokens.withoutContextStartToken());
+                            throw new RuntimeException(EXTEND_TOKEN + " was previously deprecated, and has now been removed - please use " + FIND_ELEMENT_TOKEN + " or " + FIND_RELATIONSHIP_TOKEN + " instead");
                         } else if (FIND_ELEMENT_TOKEN.equalsIgnoreCase(firstToken)) {
                             modelItem = new FindElementParser().parse(getContext(), tokens.withoutContextStartToken());
                         } else if (FIND_RELATIONSHIP_TOKEN.equalsIgnoreCase(firstToken)) {