lib/skylight/messages/trace.rb in skylight-0.1.5 vs lib/skylight/messages/trace.rb in skylight-0.1.6.alpha1

@@ -109,12 +109,18 @@
           nil
         end
 
         def build
           return if @busted
-          raise TraceError, "trace unbalanced" unless @stack.empty?
+          unless @stack.empty?
+            remaining = @stack.map do |sp|
+              sp == :skip ? :skip : sp.category
+            end
 
+            raise TraceError, "trace unbalanced; remaining=#{remaining.inspect}"
+          end
+
           Trace.new(
             uuid:     'TODO',
             endpoint: endpoint,
             spans:    spans)
         end
@@ -139,10 +145,10 @@
         end
 
         def pop
           unless sp = @stack.pop
             @busted = true
-            raise TraceError, "trace unbalanced"
+            raise TraceError, "closing span -- trace unbalanced"
           end
 
           @parents.pop if :skip != sp
 
           sp