From 690369f23acd3f7de83cff6d1ae5893b75505e77 Mon Sep 17 00:00:00 2001
From: Saoirse Aronson <saoirse@apple.com>
Date: Thu, 22 Oct 2026 17:12:37 +0200
Subject: [PATCH] Stop swalloing errors in Rule.apply

If expressions throw an error or evaluate to a non-boolean value,
currently Rule.apply just swallows the error. Instead the error should
be bubbled up through the stream.
---
 .../src/main/java/org/eclipse/biscuit/datalog/Rule.java       | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/biscuit-core/src/main/java/org/eclipse/biscuit/datalog/Rule.java b/biscuit-core/src/main/java/org/eclipse/biscuit/datalog/Rule.java
index e7457720..6aa3d584 100644
--- a/biscuit-core/src/main/java/org/eclipse/biscuit/datalog/Rule.java
+++ b/biscuit-core/src/main/java/org/eclipse/biscuit/datalog/Rule.java
@@ -72,10 +72,10 @@ public Stream<Result<Pair<Origin, Fact>, Error>> apply(
                 }
                 // continue evaluating if true
               } else {
-                return Stream.empty();
+                return Stream.of(Result.err(new Error.InvalidType()));
               }
             } catch (Error error) {
-              return Stream.empty();
+              return Stream.of(Result.err(error));
             }
           }