--- mod_macro.c	Wed Feb 10 00:09:24 2016
+++ new_mod_macro.c	Wed Jul  6 09:06:00 2016
@@ -249 +249,2 @@ static const char *check_macro_arguments(apr_pool_
-        else if (!looks_like_an_argument(tab[i])) {
+        
+        if (!looks_like_an_argument(tab[i])) {
@@ -256,0 +258,6 @@ static const char *check_macro_arguments(apr_pool_
+        if ((tab[i][0] == '$') && (tab[i][1] == '{')) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, NULL, APLOGNO(02805)
+                         "macro '%s' (%s) "
+                         "argument name '%s' (#%d) clashes with 'Define' syntax '${...}', better use '$(...)'.",
+                         macro->name, macro->location, tab[i], i + 1);
+        }