Error in AsValidator when using nested parameters

Possible fix is to rescue all errors and re-raise as a Grape::Exceptions::Validation.

module Grape
  module Validations
    class AsValidator < Base
      def initialize(attrs, options, required, scope, opts = {})
        @renamed_options = options
        super
      end

      def validate_param!(attr_name, params)
        params[@renamed_options] = params[attr_name]
      rescue StandardError => _e
        raise Grape::Exceptions::Validation.new(
          params: [@scope.full_name(attr_name)],
          message: message(:invalid_format),
        )
      end
    end
  end
end

Start at Grape::Validations::AsValidator#validate_param! and inspect how nested parameters reach the assignment using @renamed_options. Confirm that failures there become Grape::Exceptions::Validation with the scoped attribute and invalid-format message, rather than an unrelated raw error.