Move Decimal from the sandbox into production.
diff --git a/Lib/test/test___all__.py b/Lib/test/test___all__.py
index 6a6c99f..ea23846 100644
--- a/Lib/test/test___all__.py
+++ b/Lib/test/test___all__.py
@@ -82,6 +82,7 @@
         self.check_all("copy_reg")
         self.check_all("csv")
         self.check_all("dbhash")
+        self.check_all("decimal")
         self.check_all("difflib")
         self.check_all("dircache")
         self.check_all("dis")