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-rw-r--r--lib/rubygems/specification.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/rubygems/specification.rb b/lib/rubygems/specification.rb
index e387ada2b3..57f0429b56 100644
--- a/lib/rubygems/specification.rb
+++ b/lib/rubygems/specification.rb
@@ -723,6 +723,9 @@ class Gem::Specification < Gem::BasicSpecification
def self._all # :nodoc:
unless defined?(@@all) && @@all then
@@all = stubs.map(&:to_spec)
+ if @@all.any?(&:nil?) # TODO: remove once we're happy
+ raise "nil spec! included in #{stubs.inspect}"
+ end
# After a reset, make sure already loaded specs
# are still marked as activated.