From d033a045aa46ff876ad2c9f6929e2095b2481cdf Mon Sep 17 00:00:00 2001
From: Chris Dyer <redpony@gmail.com>
Date: Fri, 25 Apr 2014 23:45:32 -0400
Subject: check for non-rescorable hypergraphs

---
 decoder/decoder.cc | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'decoder/decoder.cc')

diff --git a/decoder/decoder.cc b/decoder/decoder.cc
index 354ea2d9..41f36822 100644
--- a/decoder/decoder.cc
+++ b/decoder/decoder.cc
@@ -755,6 +755,11 @@ bool DecoderImpl::Decode(const string& input, DecoderObserver* o) {
     if (!SILENT) cerr << "  *** NODES NOT UNIQUELY IDENTIFIED ***\n";
   }
 
+  if (!forest.ArePreGoalEdgesArity1()) {
+    cerr << "Pre-goal edges are not arity-1. The decoder requires this.\n";
+    abort();
+  }
+
   const bool show_tree_structure=conf.count("show_tree_structure");
   if (!SILENT) forest_stats(forest,"  Init. forest",show_tree_structure,oracle.show_derivation);
   if (conf.count("show_expected_length")) {
-- 
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