func registerSTSRouter(router *mux.Router) {
	// Initialize STS.
	sts := &stsAPIHandlers{}

	// STS Router
	stsRouter := router.NewRoute().PathPrefix(SlashSeparator).Subrouter()

	// Assume roles with no JWT, handles AssumeRole.
	stsRouter.Methods(http.MethodPost).MatcherFunc(func(r *http.Request, rm *mux.RouteMatch) bool {

  }

  private abstract static class ToReproduceGenericSignatureFormatError<V> {
    private abstract class BaseOuter {
      abstract class BaseInner {}
    }

    private abstract class SubOuter extends BaseOuter {
      private abstract class SubInner extends BaseInner {}
    }
  }

  // For Guava bug https://github.com/google/guava/issues/1025

  }

  private abstract static class ToReproduceGenericSignatureFormatError<V> {
    private abstract class BaseOuter {
      abstract class BaseInner {}
    }

    private abstract class SubOuter extends BaseOuter {
      private abstract class SubInner extends BaseInner {}
    }
  }

  // For Guava bug https://github.com/google/guava/issues/1025