anchor.diff:      Ar = function_arity(Def),
       Env1 = lfe_env:add_fbinding(Name, Ar, Def, Env0),
       Mst#umac{env=Env1};
  +collect_ewc_macro(['define-macro'|_], Mst) ->
  +    %% We ignore ewc macros here as they are not exportable.
  +    Mst;
   collect_ewc_macro([progn|Fs], Mst) ->
       lists:foldl(fun collect_ewc_macro/2, Mst, Fs).
   
  
positive.code:     lists:foldl(fun collect_ewc_macro/2, Mst, Fs);
  collect_macro({['extend-module'|Mdef],_}, Mst) ->
      collect_mdef(Mdef, Mst);
  collect_macro(_, Mst) -> Mst.
  
  collect_ewc_macro([set,Name,Val], #umac{env=Env0}=Mst) ->
      Env1 = lfe_env:add_vbinding(Name, Val, Env0),
  
negative.code: %% Author  : Robert Virding
  %% Purpose : Lisp Flavoured Erlang macro export function builder.
  
  %% Build the LFE-EXPAND-EXPORTED-MACRO (L-E-E-M) function which
  %% exports macros so they can be found by the macro expander without
  %% needing to inlcude them. If the module foo exports macro bar then
  %% it can be called by doing (foo:bar ...).
  %%
  %% This version does not actually expand any macros but just collects
  %% them. Macros that are to be exported are entered into the L-E-E-M
  %% function so they can be exported and called from the outside. We
  %% also enter all the functions and variables defined inside ewc so
  %% they can be reached from these macros when the L-E-E-M function is
  %% compiled. We do NOT need to save the ewc macros as they will
  %% accessible when he module is compiled.
  %%
  %% The macros will be expanded in the context of the module when it is
  %% later compiled and not in the context of the calling module. This
  %% is more consistent and is easier.
  %%
  %% The matching is done in two steps: first we test whether the call
  %% name is one of our known macros; if so we test whether the
  