@Override
      public @NotNull Collection<? extends Symbol> resolveReference() {
        PsiSnippetDocTagValue snippet = PsiTreeUtil.getParentOfType(value, PsiSnippetDocTagValue.class);
        if (snippet == null) return List.of();
        SnippetMarkup markup = SnippetMarkup.fromSnippet(snippet);
        if (markup == null) return List.of();
        String region = value.getValue();
        SnippetMarkup.MarkupNode start = markup.getRegionStart(region);
        if (start == null) return List.of();
        PsiElement markupContext = markup.getContext();
        PsiFile file = markupContext.getContainingFile();
        if (file == null) return List.of();
        return List.of(
          new SnippetRegionSymbol(file,
                                  start.range().shiftRight(markupContext.getTextRange().getStartOffset())));
      }
@Override
      public @NotNull Collection<? extends Symbol> resolveReference()