diff --git a/lib/puppet/parser/resource.rb b/lib/puppet/parser/resource.rb
index <HASH>..<HASH> 100644
--- a/lib/puppet/parser/resource.rb
+++ b/lib/puppet/parser/resource.rb
@@ -66,6 +66,8 @@ class Puppet::Parser::Resource < Puppet::Resource
   # is drawn from  the class to the stage.   The stage for containment
   # defaults to main, if none is specified.
   def add_edge_to_stage
+    return unless self.type.to_s.downcase == "class"
+
     unless stage = catalog.resource(:stage, self[:stage] || (scope && scope.resource && scope.resource[:stage]) || :main)
       raise ArgumentError, "Could not find stage #{self[:stage] || :main} specified by #{self}"
     end
Maint: Fix a #<I> introduced log inconsistency

When we moved code from the compiler to parser/resource, we lost
a conditional that prevented defined resources from gaining containment
edges to stages. Adding a stage to a defined resource was usually
harmless, but it violated the invariant of "resources should only have
exactly one container as their direct parent", producing a <I>% chance of
a malformed containment path in log messages.