From 97313f8ba251f45f44b7225eb764f97725e5344d Mon Sep 17 00:00:00 2001
From: Marshall Lochbaum <mwlochbaum@gmail.com>
Date: Tue, 2 Nov 2021 18:04:27 -0400
Subject: Check that predicate expression isn't Nothing

---
 src/c.bqn | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src')

diff --git a/src/c.bqn b/src/c.bqn
index f94e87e6..c4889f7a 100644
--- a/src/c.bqn
+++ b/src/c.bqn
@@ -233,6 +233,7 @@ Parse ← {r‿vn‿i‿e‿def←𝕨⋄nv←≠vn
   tr←1≤er←ir⊏˜IT»ps                         # er: expression role; tr: train or modifier expression
   no←0⌈-ir⋄ne←0⌈-er⋄nei↩g⋄nx⊏˜↩gr           # Nothing value; expression
   "Nothing (·) cannot be assigned"_nerr ne×a
+  "Can't use Nothing (·) as predicate"_nerr ne×𝕩=2+⊑bH
   oa←⌽/hg<op←(er<2)∧r≥2⋄ro←op∨«op∧m2←r=3    # op: active modifiers; ro: mod or right operand
   "Missing operand"_nerr op×2(«⌈m2×»)no⌈2×m2≥ro∨r∊↕2
   s←𝕩=sep⋄fo←𝕩∊⟨2+⊑bB,1+⊑bH⟩                # Separators, function open { or ;
-- 
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