@NotNull
  private List<StreamChain> buildChains(@NotNull List<List<PsiMethodCallExpression>> chains, @NotNull PsiElement context) {
    return ContainerUtil.map(chains, x -> myChainTransformer.transform(x, context));
  }
@NotNull
  private List<StreamChain> buildChains(@NotNull List<List<PsiMethodCallExpression>> chains, @NotNull PsiElement context)