call-site.java

package org.jruby.runtime.callsite;

import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.RubyModule;
import org.jruby.RubyClass;
import org.jruby.RubyObject;

public class RespondToCallSite extends NormalCachingCallSite {

    public RespondToCallSite() {
        super("respond_to?");
    }

    @Override
    public IRubyObject call(ThreadContext context, IRubyObject caller, IRubyObject self, IRubyObject arg) {
      RubyClass klass = self.getMetaClass();
      if(!klass.searchMethod(arg.toString()).isUndefined()) {
        return context.getRuntime().getTrue();
      } else {
        return context.getRuntime().getFalse();
      }
    }
}

gistfile1.txt

Index: src/org/jruby/RubyInstanceConfig.java
===================================================================
--- src/org/jruby/RubyInstanceConfig.java	(revision 8874)
+++ src/org/jruby/RubyInstanceConfig.java	(working copy)
@@ -217,6 +217,8 @@
             = SafePropertyAccessor.getProperty("jruby.jit.exclude");
     public static boolean nativeEnabled = true;
     
+    public static final boolean YEHUDA_FAIL
+            = SafePropertyAccessor.getBoolean("yehuda.fail");
 
     public static interface LoadServiceCreator {
         LoadService create(Ruby runtime);

method-index.java

    public synchronized static CallSite getCallSite(String name) {
        if (RubyInstanceConfig.YEHUDA_FAIL) {
          if (name.equals("respond_to?")) {
            return new RespondToCallSite();
          }
        }