Adding upstream version 2:9.1.1230.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

runtime/syntax/testdir/input/vim9_ex_enum_fold.vim

@@ -0,0 +1,39 @@
+vim9script
+# Vim :enum command
+# VIM_TEST_SETUP let g:vimsyn_folding = 'ef'
+# VIM_TEST_SETUP setl fdc=2 fdl=99 fdm=syntax
+
+interface Interface1
+endinterface
+interface Interface2
+endinterface
+
+enum Enum1
+endenum
+
+export enum Enum2
+endenum
+
+enum Enum3
+  Value1,
+  Value2,
+  Value3
+endenum
+
+enum Enum4
+  Value1,
+  Value2,
+  Value3
+  def Method1()
+  enddef
+endenum
+
+enum Enum5 implements Interface1, Interface2
+    Value1,
+    Value2,
+    Value3
+    def Method1()
+      def Nested()
+      enddef
+    enddef
+endenum