* ability to output NodeBuilders without first converting them to Nodes---useful for debugging.

* language-dependent Node::toString()
* some minor proof-related cleanup

1 files changed, 8 insertions, 1 deletions

diff --git a/src/expr/node_value.cpp b/src/expr/node_value.cpp
index 5fe48b01d..f1fade69d 100644
--- a/src/expr/node_value.cpp
+++ b/src/expr/node_value.cpp
@@ -39,16 +39,23 @@ NodeValue NodeValue::s_null(0);
 
 string NodeValue::toString() const {
   stringstream ss;
-  toStream(ss);
+  toStream(ss, -1, false, Options::current()->outputLanguage);
   return ss.str();
 }
 
 void NodeValue::toStream(std::ostream& out, int toDepth, bool types,
                          OutputLanguage language) const {
+  // Ensure that this node value is live for the length of this call.
+  // It really breaks things badly if we don't have a nonzero ref
+  // count, even just for printing.
+  RefCountGuard guard(this);
+
   Printer::getPrinter(language)->toStream(out, TNode(this), toDepth, types);
 }
 
 void NodeValue::printAst(std::ostream& out, int ind) const {
+  RefCountGuard guard(this);
+
   indent(out, ind);
   out << '(';
   out << getKind();