From f39979c6d3e49b09aa82fea5e167d4253f63d71f Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Fri, 17 Jul 2015 11:33:39 +0200
Subject: [PATCH] Make printValue() interruptible

Fixes #572.
---
 src/libexpr/eval.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index d61ee7e80..7b74d99b1 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -63,6 +63,8 @@ void Bindings::sort()
 
 static void printValue(std::ostream & str, std::set<const Value *> & active, const Value & v)
 {
+    checkInterrupt();
+
     if (active.find(&v) != active.end()) {
         str << "<CYCLE>";
         return;