public static @Nullable EquivalenceDescriptorProvider getInstance(@NotNull PsiElement context) {
    //noinspection TestOnlyProblems
    if (ourUseDefaultEquivalence) {
      return null;
    }

    for (EquivalenceDescriptorProvider descriptorProvider : EP_NAME.getExtensionList()) {
      if (descriptorProvider.isMyContext(context)) {
        return descriptorProvider;
      }
    }
    return null;
  }
public static @Nullable EquivalenceDescriptorProvider getInstance(@NotNull PsiElement context)