Remove remains of %nestedworkaround

Also the nestedworkaround feature it uses - both were deprecated over 10
years ago in SWIG 3.0.0.  Since then uses of these have done nothing
except emit a warning.

CHANGES.current

@@ -7,6 +7,12 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.3.0 (in progress)
 ===========================
 
+2024-09-12: olly
+	    Remove remains of %nestedworkaround and the nestedworkaround
+	    feature it uses, which were deprecated over 10 years ago in SWIG
+	    3.0.0.  Since then uses of these have done nothing except emit a
+	    warning.
+
 2024-09-11: wsfulton
             [C# Java] #1188 Add the %interface_additional macro to the family of
             %interface macros for adding additional interfaces for the generated

Doc/Manual/SWIGPlus.html

@@ -5963,12 +5963,12 @@ However, there was a workaround for nested class support in these older versions
 the nested class in the global scope, adding in a typedef for the nested class in the global scope and
 using the "nestedworkaround" feature on the nested class. This resulted in approximately the
 same behaviour as the "flatnested" feature. With proper nested class support now available in SWIG-3.0.0, this
-feature has been deprecated and no longer works requiring code changes. If you see the following warning:
+feature was deprecated and has now been removed. If you see the following error:
 </p>
 
 <div class="shell">
 <pre>
-example.i:8: Warning 126: The nestedworkaround feature is deprecated
+example.i:8: Error: Unknown directive '%nestedworkaround'
 </pre>
 </div>
 

Doc/Manual/Warnings.html

@@ -371,8 +371,8 @@ example.i(4) : Syntax error in input(1).
 <H3><a name="Warnings_nn10">19.9.1 Deprecated features (100-199)</a></H3>
 
 
-<ul>
-<li>126. The 'nestedworkaround' feature is deprecated.
+<p>None currently.</p>
+
 </ul>
 
 <H3><a name="Warnings_nn11">19.9.2 Preprocessor (200-299)</a></H3>

Lib/swig.swg

@@ -115,11 +115,6 @@
 #define %nocallback     %feature("callback","0")
 #define %clearcallback  %feature("callback","")
 
-/* the %nestedworkaround directive (deprecated) */
-#define %nestedworkaround       %feature("nestedworkaround")
-#define %nonestedworkaround     %feature("nestedworkaround","0")
-#define %clearnestedworkaround  %feature("nestedworkaround","")
-
 /* the %flatnested directive */
 #define %flatnested       %feature("flatnested")
 #define %noflatnested     %feature("flatnested","0")

Source/CParse/parser.y

@@ -1320,10 +1320,6 @@ static void single_new_feature(const char *featurename, String *val, Hash *featu
 
   /* Printf(stdout, "single_new_feature: [%s] [%s] [%s] [%s] [%s] [%s]\n", featurename, val, declaratorid, t, ParmList_str_defaultargs(declaratorparms), qualifier); */
 
-  /* Warn about deprecated features */
-  if (strcmp(featurename, "nestedworkaround") == 0)
-    Swig_warning(WARN_DEPRECATED_NESTED_WORKAROUND, cparse_file, cparse_line, "The 'nestedworkaround' feature is deprecated.\n");
-
   fname = NewStringf("feature:%s",featurename);
   if (declaratorid) {
     fixname = feature_identifier_fix(declaratorid);

Source/Include/swigwarn.h

@@ -54,7 +54,7 @@
 /* Unused since 4.2.0: #define WARN_DEPRECATED_NODEFAULT     123 */
 /* Unused since 4.1.0: #define WARN_DEPRECATED_TYPEMAP_LANG  124 */
 /* Unused since 4.2.0: #define WARN_DEPRECATED_INPUT_FILE    125 */
-#define WARN_DEPRECATED_NESTED_WORKAROUND 126
+/* Unused since 4.3.0: #define WARN_DEPRECATED_NESTED_WORKAROUND 126 */
 
 /* -- Preprocessor -- */