condition updated to preven printf from sprintf redefinition

1 files changed, 6 insertions, 4 deletions

diff --git a/mrblib/print.rb b/mrblib/print.rb
index 3ebd77ee6..c4ce74d6b 100644
--- a/mrblib/print.rb
+++ b/mrblib/print.rb
@@ -51,11 +51,13 @@ module Kernel
   ##
   # Invoke method +sprintf+ and pass +*args+ to it.
   # Pass return value to +print+ of STDOUT.
-  def printf(*args)
-    if Kernel.respond_to?(:sprintf)
+  if Kernel.respond_to?(:sprintf) and Kernel.respond_to?(:__printstr__)
+    def printf(*args)
       __printstr__(sprintf(*args))
-    else
-      raise NotImplementedError.new('sprintf not available')
+    end
+  else
+    def printf(*args)
+      raise NotImplementedError.new('printf not available')
     end
   end