fixed issue 2371

The lifting of multi-partition WLs now also works if the WL occurs in the CEXPR position of an N-code node. Also added to the help output. Note that the test for the time being requires -noSOP and -noSRP; this is issue 2372, which is not yet fixed.

src/libsac2c/scanparse/handle_with_loop_generators.c

@@ -415,7 +415,7 @@ HWLGcode (node *arg_node, info *arg_info)
     mem_lastassign = INFO_HWLG_LASTASSIGN (arg_info);
 
     INFO_HWLG_LASTASSIGN (arg_info) = NULL;
-    CODE_CEXPRS (arg_node) = TRAVdo (CODE_CEXPRS (arg_node), arg_info);
+    CODE_CEXPRS (arg_node) = TRAVopt (CODE_CEXPRS (arg_node), arg_info);
 
     expr_assign = INFO_HWLG_LASTASSIGN (arg_info);
     INFO_HWLG_LASTASSIGN (arg_info) = mem_lastassign;