diff --git a/README.md b/README.md
index deeb765..3bbc969 100644
--- a/README.md
+++ b/README.md
@@ -18,12 +18,10 @@ Library:
 ```rust
 use cwdemangle::demangle;
 
-let symbol = "BuildLight__9CGuiLightCFv";
-if let Some(result) = demangle(symbol) {
+if let Some(result) = demangle("BuildLight__9CGuiLightCFv") {
     println!("{}", result);
-    Ok(())
 } else {
-    Err("Couldn't demangle symbol (not a C++ symbol?)")
+    eprintln!("Couldn't demangle symbol (not a C++ symbol?)");
 }
 ```
 
diff --git a/src/lib.rs b/src/lib.rs
index 39ef636..3a61842 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -518,5 +518,13 @@ mod tests {
             demangle("__dt__26__partial_array_destructorFv"),
             Some("__partial_array_destructor::~__partial_array_destructor(void)".to_string())
         );
+        assert_eq!(
+            demangle("__distance<Q34rstl195red_black_tree<13TGameScriptId,Q24rstl32pair<13TGameScriptId,9TUniqueId>,1,Q24rstl52select1st<Q24rstl32pair<13TGameScriptId,9TUniqueId>>,Q24rstl21less<13TGameScriptId>,Q24rstl17rmemory_allocator>14const_iterator>__4rstlFQ34rstl195red_black_tree<13TGameScriptId,Q24rstl32pair<13TGameScriptId,9TUniqueId>,1,Q24rstl52select1st<Q24rstl32pair<13TGameScriptId,9TUniqueId>>,Q24rstl21less<13TGameScriptId>,Q24rstl17rmemory_allocator>14const_iteratorQ34rstl195red_black_tree<13TGameScriptId,Q24rstl32pair<13TGameScriptId,9TUniqueId>,1,Q24rstl52select1st<Q24rstl32pair<13TGameScriptId,9TUniqueId>>,Q24rstl21less<13TGameScriptId>,Q24rstl17rmemory_allocator>14const_iteratorQ24rstl20forward_iterator_tag"),
+            Some("rstl::__distance<rstl::red_black_tree<TGameScriptId, rstl::pair<TGameScriptId, TUniqueId>, 1, rstl::select1st<rstl::pair<TGameScriptId, TUniqueId>>, rstl::less<TGameScriptId>, rstl::rmemory_allocator>::const_iterator>(rstl::red_black_tree<TGameScriptId, rstl::pair<TGameScriptId, TUniqueId>, 1, rstl::select1st<rstl::pair<TGameScriptId, TUniqueId>>, rstl::less<TGameScriptId>, rstl::rmemory_allocator>::const_iterator, rstl::red_black_tree<TGameScriptId, rstl::pair<TGameScriptId, TUniqueId>, 1, rstl::select1st<rstl::pair<TGameScriptId, TUniqueId>>, rstl::less<TGameScriptId>, rstl::rmemory_allocator>::const_iterator, rstl::forward_iterator_tag)".to_string())
+        );
+        assert_eq!(
+            demangle("__ct__Q210Metrowerks683compressed_pair<RQ23std301allocator<Q33std276__tree_deleter<Q23std34pair<Ci,Q212petfurniture8Instance>,Q33std131__multimap_do_transform<i,Q212petfurniture8Instance,Q23std7less<i>,Q23std53allocator<Q23std34pair<Ci,Q212petfurniture8Instance>>,0>13value_compare,Q23std53allocator<Q23std34pair<Ci,Q212petfurniture8Instance>>>4node>,Q210Metrowerks337compressed_pair<Q210Metrowerks12number<Ul,1>,PQ33std276__tree_deleter<Q23std34pair<Ci,Q212petfurniture8Instance>,Q33std131__multimap_do_transform<i,Q212petfurniture8Instance,Q23std7less<i>,Q23std53allocator<Q23std34pair<Ci,Q212petfurniture8Instance>>,0>13value_compare,Q23std53allocator<Q23std34pair<Ci,Q212petfurniture8Instance>>>4node>>FRQ23std301allocator<Q33std276__tree_deleter<Q23std34pair<Ci,Q212petfurniture8Instance>,Q33std131__multimap_do_transform<i,Q212petfurniture8Instance,Q23std7less<i>,Q23std53allocator<Q23std34pair<Ci,Q212petfurniture8Instance>>,0>13value_compare,Q23std53allocator<Q23std34pair<Ci,Q212petfurniture8Instance>>>4node>Q210Metrowerks337compressed_pair<Q210Metrowerks12number<Ul,1>,PQ33std276__tree_deleter<Q23std34pair<Ci,Q212petfurniture8Instance>,Q33std131__multimap_do_transform<i,Q212petfurniture8Instance,Q23std7less<i>,Q23std53allocator<Q23std34pair<Ci,Q212petfurniture8Instance>>,0>13value_compare,Q23std53allocator<Q23std34pair<Ci,Q212petfurniture8Instance>>>4node>"),
+            Some("Metrowerks::compressed_pair<std::allocator<std::__tree_deleter<std::pair<const int, petfurniture::Instance>, std::__multimap_do_transform<int, petfurniture::Instance, std::less<int>, std::allocator<std::pair<const int, petfurniture::Instance>>, 0>::value_compare, std::allocator<std::pair<const int, petfurniture::Instance>>>::node>&, Metrowerks::compressed_pair<Metrowerks::number<unsigned long, 1>, std::__tree_deleter<std::pair<const int, petfurniture::Instance>, std::__multimap_do_transform<int, petfurniture::Instance, std::less<int>, std::allocator<std::pair<const int, petfurniture::Instance>>, 0>::value_compare, std::allocator<std::pair<const int, petfurniture::Instance>>>::node*>>::compressed_pair(std::allocator<std::__tree_deleter<std::pair<const int, petfurniture::Instance>, std::__multimap_do_transform<int, petfurniture::Instance, std::less<int>, std::allocator<std::pair<const int, petfurniture::Instance>>, 0>::value_compare, std::allocator<std::pair<const int, petfurniture::Instance>>>::node>&, Metrowerks::compressed_pair<Metrowerks::number<unsigned long, 1>, std::__tree_deleter<std::pair<const int, petfurniture::Instance>, std::__multimap_do_transform<int, petfurniture::Instance, std::less<int>, std::allocator<std::pair<const int, petfurniture::Instance>>, 0>::value_compare, std::allocator<std::pair<const int, petfurniture::Instance>>>::node*>)".to_string())
+        );
     }
 }