1 files changed, 14 insertions, 2 deletions
diff --git a/lib/ostruct.rb b/lib/ostruct.rb
index a08561d6c9..c762baa5a5 100644
--- a/lib/ostruct.rb
+++ b/lib/ostruct.rb
@@ -107,7 +107,15 @@
 # For all these reasons, consider not using OpenStruct at all.
 #
 class OpenStruct
-  VERSION = "0.5.5"
+  VERSION = "0.6.0"
+
+  HAS_PERFORMANCE_WARNINGS = begin
+    Warning[:performance]
+    true
+  rescue NoMethodError, ArgumentError
+    false
+  end
+  private_constant :HAS_PERFORMANCE_WARNINGS
 
   #
   # Creates a new OpenStruct object.  By default, the resulting OpenStruct
@@ -124,6 +132,10 @@ class OpenStruct
   #   data   # => #<OpenStruct country="Australia", capital="Canberra">
   #
   def initialize(hash=nil)
+    if HAS_PERFORMANCE_WARNINGS && Warning[:performance]
+       warn "OpenStruct use is discouraged for performance reasons", uplevel: 1, category: :performance
+    end
+
     if hash
       update_to_values!(hash)
     else
@@ -364,7 +376,7 @@ class OpenStruct
     end
     @table.delete(sym) do
       return yield if block
-      raise! NameError.new("no field `#{sym}' in #{self}", sym)
+      raise! NameError.new("no field '#{sym}' in #{self}", sym)
     end
   end