1 files changed, 1 insertions, 0 deletions
diff --git a/eval.h b/eval.h
index 78a0f8b0..06bae699 100644
--- a/eval.h
+++ b/eval.h
@@ -32,6 +32,7 @@ extern val last_form_evaled, last_form_expanded;
 
 noreturn val eval_error(val form, val fmt, ...);
 val lookup_origin(val form);
+void error_trace(val exsym, val exvals, val out_stream, val prefix);
 val make_env(val fbindings, val vbindings, val up_env);
 val copy_env(val oenv);
 val env_fbind(val env, val sym, val fun);