4 files changed, 18 insertions, 7 deletions
diff --git a/lib/puppet/parser/ast/definition.rb b/lib/puppet/parser/ast/definition.rb
index 2b7506446..0c65c702c 100644
--- a/lib/puppet/parser/ast/definition.rb
+++ b/lib/puppet/parser/ast/definition.rb
@@ -24,9 +24,6 @@ class Puppet::Parser::AST::Definition < Puppet::Parser::AST::Branch
 
     # Create a resource that knows how to evaluate our actual code.
     def evaluate(scope)
-        # Do nothing if the resource already exists; this provides the singleton nature classes need.
-        return if scope.catalog.resource(self.class.name, self.classname)
-
         resource = Puppet::Parser::Resource.new(:type => self.class.name, :title => self.classname, :scope => scope, :source => scope.source)
 
         scope.catalog.tag(*resource.tags)
diff --git a/lib/puppet/parser/ast/hostclass.rb b/lib/puppet/parser/ast/hostclass.rb
index 8d4d01660..7f89f8151 100644
--- a/lib/puppet/parser/ast/hostclass.rb
+++ b/lib/puppet/parser/ast/hostclass.rb
@@ -21,7 +21,14 @@ class Puppet::Parser::AST::HostClass < Puppet::Parser::AST::Definition
     # Make sure our parent class has been evaluated, if we have one.
     def evaluate(scope)
         if parentclass and ! scope.catalog.resource(self.class.name, parentclass)
-            resource = parentobj.evaluate(scope)
+            parent_resource = parentobj.evaluate(scope)
+        end
+
+        # Do nothing if the resource already exists; this makes sure we don't
+        # get multiple copies of the class resource, which helps provide the
+        # singleton nature of classes.
+        if resource = scope.catalog.resource(self.class.name, self.classname)
+            return resource
         end
 
         super
diff --git a/lib/puppet/parser/interpreter.rb b/lib/puppet/parser/interpreter.rb
index 33f66e8c2..d4655c403 100644
--- a/lib/puppet/parser/interpreter.rb
+++ b/lib/puppet/parser/interpreter.rb
@@ -28,10 +28,8 @@ class Puppet::Parser::Interpreter
         begin
           return Puppet::Parser::Compiler.new(node, env_parser).compile
         rescue => detail
+          puts detail.backtrace if Puppet[:trace]
           raise Puppet::Error, detail.to_s + " on node %s" % node.name
-          if Puppet[:trace]
-              puts detail.backtrace
-          end
         end
     end
 
diff --git a/lib/puppet/parser/resource.rb b/lib/puppet/parser/resource.rb
index fb0799011..46be89ca2 100644
--- a/lib/puppet/parser/resource.rb
+++ b/lib/puppet/parser/resource.rb
@@ -133,6 +133,15 @@ class Puppet::Parser::Resource
         tag(@ref.title) if valid_tag?(@ref.title.to_s)
     end
 
+    # Is this resource modeling an isomorphic resource type?
+    def isomorphic?
+        if builtin?
+            return @ref.builtintype.isomorphic?
+        else
+            return true
+        end
+    end
+
     # Merge an override resource in.  This will throw exceptions if
     # any overrides aren't allowed.
     def merge(resource)