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-rw-r--r--mu.arc3
1 files changed, 2 insertions, 1 deletions
diff --git a/mu.arc b/mu.arc
index f202a3a3..6b33d19a 100644
--- a/mu.arc
+++ b/mu.arc
@@ -397,7 +397,8 @@
                              (do1 caller-arg-idx.context
                                 (++ caller-arg-idx.context)))
                     (trace "arg" arg " " idx " " caller-args.context)
-                    (m caller-args.context.idx))
+                    (if (len> caller-args.context idx)
+                      (m caller-args.context.idx)))
                 type
                   (ty (caller-args.context arg.0))
                 otype