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edit_env_rep::exec_until_arg (tree t, path p, string var, int level) {
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// cout << " " << macro_arg << "\n";
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macro_arg->item->contains (r->label))
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tree arg= macro_arg->item [r->label];
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list<hashmap<string,tree> > old_var= macro_arg;
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list<hashmap<string,path> > old_src= macro_src;
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found= (r->label == var);
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if ((N(t) > 1) && found) {