fix datahandler

bug introduced in e83fde09346d4706f0b5d262b7950c0d05389757

1 files changed, 1 insertions, 2 deletions

diff --git a/luatexbase-mcb.dtx b/luatexbase-mcb.dtx
index 4bbbcb7..bace1f9 100644
--- a/luatexbase-mcb.dtx
+++ b/luatexbase-mcb.dtx
@@ -592,6 +592,7 @@ local function datahandler (name)
         for _, f in ipairs(callbacklist[name]) do
             data = f.func(data, ...)
         end
+        return data
     end
 end
 %    \end{macrocode}
@@ -1017,12 +1018,10 @@ end
 %    \begin{macrocode}
 function add_process_input_buffer()
     luatexbase.add_to_callback('process_input_buffer', function(buffer)
-            texio.write_nl("I'm a dummy process_input_buffer")
             return buffer.."\\msg{dummy}"
         end,
         'dummy process_input_buffer')
     luatexbase.add_to_callback('process_input_buffer', function(buffer)
-            texio.write_nl("I'm an other dummy process_input_buffer")
             return buffer.."\\msg{otherdummy}"
         end,
         'other dummy process_input_buffer')