From c11499cef8ad335bd443f320ab2e100ac7ee15fb Mon Sep 17 00:00:00 2001
From: Marshall Lochbaum <mwlochbaum@gmail.com>
Date: Mon, 18 Jan 2021 20:53:26 -0500
Subject: Check non-principal argument rank in search functions

---
 spec/reference.bqn | 1 +
 1 file changed, 1 insertion(+)

(limited to 'spec/reference.bqn')

diff --git a/spec/reference.bqn b/spec/reference.bqn
index c68e6a53..fa37973a 100644
--- a/spec/reference.bqn
+++ b/spec/reference.bqn
@@ -394,6 +394,7 @@ GroupInds←{
 IndexOf←{
   c←1-˜=𝕨
   ! 0≤c
+  ! c≤=𝕩
   𝕨 (0<≠𝕨)◶⟨0⎉c∘⊢,(+˝∧`)≢⎉c⎉c‿∞⟩ 𝕩
 }
 UniqueMask←{
-- 
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