Program: 39673
Project: 39673
Buggy source:
@Nonnull private static TypeSpec buildBuilderStepInterface(@Nonnull final ComponentDescriptor descriptor,@Nonnull final Step step){
  final int stepIndex=step.getIndex();
  final TypeSpec.Builder builder=TypeSpec.interfaceBuilder("String_Node_Str" + stepIndex);
  builder.addModifiers(Modifier.PUBLIC,Modifier.STATIC);
  builder.addTypeVariables(ProcessorUtil.getTypeArgumentsAsNames(descriptor.getDeclaredType()));
  if (!descriptor.getDeclaredType().getTypeArguments().isEmpty()) {
    builder.addAnnotation(AnnotationSpec.builder(SuppressWarnings.class).addMember("String_Node_Str","String_Node_Str","String_Node_Str").build());
  }
  for (  final StepMethod stepMethod : step.getMethods()) {
    final StepMethodType stepMethodType=stepMethod.getStepMethodType();
    if (stepMethod.isBuildIntrinsic()) {
      builder.addMethod(buildStepInterfaceMethod("String_Node_Str",step,stepMethodType,m -> {
      }
).build());
    }
 else {
      builder.addMethod(buildStepInterfaceMethod(stepMethod.getName(),step,stepMethodType,m -> {
        final ExecutableType propMethodType=stepMethod.getPropMethodType();
        if (null != propMethodType) {
          ProcessorUtil.copyTypeParameters(propMethodType,m);
        }
        if (stepMethod.isChildrenIntrinsic()) {
          m.varargs();
        }
        final ParameterSpec.Builder parameter=ParameterSpec.builder(stepMethod.getType(),stepMethod.getName());
        final ExecutableElement propMethod=stepMethod.getPropMethod();
        if (null != propMethod) {
          ProcessorUtil.copyDocumentedAnnotations(propMethod,parameter);
        }
 else         if (stepMethod.isKeyIntrinsic()) {
          parameter.addAnnotation(NONNULL_CLASSNAME);
        }
 else         if (stepMethod.isChildOfChildrenIntrinsic()) {
          m.addAnnotation(NULLABLE_CLASSNAME);
        }
        m.addParameter(parameter.build());
      }
).build());
    }
  }
  return builder.build();
}

Fixed version (ground truth):
@Nonnull private static TypeSpec buildBuilderStepInterface(@Nonnull final ComponentDescriptor descriptor,@Nonnull final Step step){
  final int stepIndex=step.getIndex();
  final TypeSpec.Builder builder=TypeSpec.interfaceBuilder("String_Node_Str" + stepIndex);
  builder.addModifiers(Modifier.PUBLIC,Modifier.STATIC);
  builder.addTypeVariables(ProcessorUtil.getTypeArgumentsAsNames(descriptor.getDeclaredType()));
  if (!descriptor.getDeclaredType().getTypeArguments().isEmpty()) {
    builder.addAnnotation(AnnotationSpec.builder(SuppressWarnings.class).addMember("String_Node_Str","String_Node_Str","String_Node_Str").build());
  }
  for (  final StepMethod stepMethod : step.getMethods()) {
    final StepMethodType stepMethodType=stepMethod.getStepMethodType();
    if (stepMethod.isBuildIntrinsic()) {
      builder.addMethod(buildStepInterfaceMethod("String_Node_Str",step,stepMethodType,m -> {
      }
).build());
    }
 else {
      builder.addMethod(buildStepInterfaceMethod(stepMethod.getName(),step,stepMethodType,m -> {
        final ExecutableType propMethodType=stepMethod.getPropMethodType();
        if (null != propMethodType) {
          ProcessorUtil.copyTypeParameters(propMethodType,m);
        }
        if (stepMethod.isChildrenIntrinsic()) {
          m.varargs();
        }
        final ParameterSpec.Builder parameter=ParameterSpec.builder(stepMethod.getType(),stepMethod.getName());
        final ExecutableElement propMethod=stepMethod.getPropMethod();
        if (null != propMethod) {
          ProcessorUtil.copyDocumentedAnnotations(propMethod,parameter);
        }
 else         if (stepMethod.isKeyIntrinsic()) {
          parameter.addAnnotation(NONNULL_CLASSNAME);
        }
 else         if (stepMethod.isChildOfChildrenIntrinsic()) {
          parameter.addAnnotation(NULLABLE_CLASSNAME);
        }
        m.addParameter(parameter.build());
      }
).build());
    }
  }
  return builder.build();
}