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-rw-r--r--activesupport/lib/active_support/core_ext/module/anonymous.rb20
1 files changed, 20 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/module/anonymous.rb b/activesupport/lib/active_support/core_ext/module/anonymous.rb
new file mode 100644
index 0000000000..60d7d9410b
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/module/anonymous.rb
@@ -0,0 +1,20 @@
+class Module
+ # A module may or may not have a name.
+ #
+ # module M; end
+ # M.name # => "M"
+ #
+ # m = Module.new
+ # m.name # => ""
+ #
+ # A module gets a name when it is first assigned to a constant. Either
+ # via the +module+ or +class+ keyword or by an explicit assignment:
+ #
+ # m = Module.new # creates an anonymous module
+ # M = m # => m gets a name here as a side-effect
+ # m.name # => "M"
+ #
+ def anonymous?
+ name == ''
+ end
+end