docs: function augmentSingleFile (fileWithContents) {
    const result = Object.assign({
      callsPartial: [],
      comments: []
    }, fileWithContents)
    const ast = Handlebars.parse(fileWithContents.contents)
    new PartialVisitor(partialCall => result.callsPartial.push(partialCall)).accept(ast)
    new ApiDocCommentVisitor(comment => result.comments.push(comment)).accept(ast)
    return result
  }