basho/lager — pull request #90 by lukyanov (2012-11-22 19:34:13+00:00)
Title: Fix custom formatter spec for lager_file_backend

lager_app.erl:
%% handlers failing to start are handled in the handler_watcher
_ = [supervisor:start_child(lager_handler_watcher_sup, [lager_event, Module, Config]) ||
{Module, Config} <- expand_handlers(Handlers)],

{Module, Config} will be always filtering out 3 element tuple, so there will never be lager_file_backend with custom formatter.