From 08115ba7569cbd21cfe89be152a311e01ebb6c88 Mon Sep 17 00:00:00 2001
From: Marshall Lochbaum <mwlochbaum@gmail.com>
Date: Fri, 15 Apr 2022 16:08:38 -0400
Subject: Mention undo headers in the error message for inverting blocks

---
 src/r1.bqn | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/r1.bqn b/src/r1.bqn
index 44d553d1..2e9ac199 100644
--- a/src/r1.bqn
+++ b/src/r1.bqn
@@ -867,7 +867,7 @@ TrainInverse ← {
 }
 FuncInverse ← (0⊸⊑ ⊣◶⟨
   {PrimInverse𝕩} 1⊸⊑                     # 0 primitive
-  (!∘"Cannot currently invert blocks")˙  # 1 block
+  (!∘"Can't invert blocks (add an undo header?)")˙  # 1 block
   1⊸⊑ AtopInverse 2⊸⊑                    # 2-train
   TrainInverse                           # 3-train
   1⊸⊑    {𝕏𝕨}⟜{Mod1Inverse𝕩} 2⊸⊑         # 4 1-modifier
-- 
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