5 files changed, 11 insertions, 7 deletions
diff --git a/starts/meaning-vm/level-0/baseref.hpp b/starts/meaning-vm/level-0/baseref.hpp
index b6e98e8..90c33e1 100644
--- a/starts/meaning-vm/level-0/baseref.hpp
+++ b/starts/meaning-vm/level-0/baseref.hpp
@@ -149,7 +149,7 @@ public:
 		decltype(concept::links) & links;
 	};
 
-	void unlink(typename links_t::iterator & it) { p->unlink(it.underlying()); }
+	void unlink(typename links_t::iterator it) { p->unlink(it.underlying()); }
 	bool crucial(typename links_t::iterator it) { return self.p->crucial(it.underlying()); }
 	void setcrucial(typename links_t::iterator it) { self.p->setcrucial(it.underlying()); }
 };
diff --git a/starts/meaning-vm/level-0/concept.cpp b/starts/meaning-vm/level-0/concept.cpp
index 373b3b7..66e5af1 100644
--- a/starts/meaning-vm/level-0/concept.cpp
+++ b/starts/meaning-vm/level-0/concept.cpp
@@ -75,7 +75,7 @@ void concept::unlink(concept* type)
 	unlink(ls.first);
 }
 
-void concept::unlink(decltype(links)::iterator & it)
+void concept::unlink(decltype(links)::iterator it)
 {
 	if (crucialparts.count(it)) {
 		throw crucial_link_type_target(selfref, it->first, it->second);
diff --git a/starts/meaning-vm/level-0/concept.hpp b/starts/meaning-vm/level-0/concept.hpp
index e885ccf..833e417 100644
--- a/starts/meaning-vm/level-0/concept.hpp
+++ b/starts/meaning-vm/level-0/concept.hpp
@@ -24,7 +24,7 @@ struct concept
 	void link(concept* type, concept* target);
 	void unlink(concept* type, concept* target);
 	void unlink(concept* type);
-	void unlink(decltype(links)::iterator & it);
+	void unlink(decltype(links)::iterator it);
 
 	bool crucial() { return iscrucial || crucialparts.size(); }
 	bool crucial(concept* type, concept* target);
diff --git a/starts/meaning-vm/level-0/memorystore.cpp b/starts/meaning-vm/level-0/memorystore.cpp
index 1d9e9f6..24e91b0 100644
--- a/starts/meaning-vm/level-0/memorystore.cpp
+++ b/starts/meaning-vm/level-0/memorystore.cpp
@@ -155,6 +155,7 @@ void dealloc(ref r, ref source)
 	if (r.linked(concepts::allocator())) { return; }
 
 	try {
+		if (r.crucial()) { throw crucial_concept(r); }
 		dealloc_from(r);
 		concept * referenced = intellect::level0::referenced(r, source);
 		if (referenced) {
diff --git a/starts/meaning-vm/level-0/ref.cpp b/starts/meaning-vm/level-0/ref.cpp
index 87e911a..513d3ce 100644
--- a/starts/meaning-vm/level-0/ref.cpp
+++ b/starts/meaning-vm/level-0/ref.cpp
@@ -3,7 +3,9 @@
 #include "errors.hpp"
 #include "memorystore.hpp"
 
+#include <iomanip>
 #include <ostream>
+#include <sstream>
 
 using namespace intellect::level0;
 using namespace concepts;
@@ -13,10 +15,11 @@ std::string ref::dump(ref skipmarkertype, ref skipmarkertarget)
 	if (self.linked(skipmarkertype, skipmarkertarget)) {
 		return {};
 	}
-	std::string ret = std::to_string((unsigned long)ptr()) + ":\n";
+	std::stringstream ss;
+	ss << std::hex << (size_t)ptr() << ":" << std::endl;
 	for (auto & link : self.links()) {
 		if (link.first.linked(allocator(), level0allocations())) { continue; }
-		ret += "  " + std::to_string((unsigned long)link.first.ptr()) + ": " + std::to_string((unsigned long)link.second.ptr()) + "\n"; 
+		ss << "  " << (size_t)link.first.ptr() << ": " << (size_t)link.second.ptr() << std::endl;
 	}
 	self.link(skipmarkertype, skipmarkertarget);
 	for (auto & link : self.links()) {
@@ -24,7 +27,7 @@ std::string ref::dump(ref skipmarkertype, ref skipmarkertarget)
 		if (link.first == skipmarkertype && link.second == skipmarkertarget) {
 			continue;
 		}
-		ret += link.second.dump(skipmarkertype, skipmarkertarget);
+		ss << link.second.dump(skipmarkertype, skipmarkertarget);
 	}
-	return ret;
+	return ss.str();
 }