attrs-heading-last-attr-empty

Empty {} as last token explicitly assigns no attrs to Section; earlier {} attaches to inline

§6.2

Input

= Heading **bold**{.b} {}

Output AST

- type: Section
  level: 1
  heading:
    - type: Text
      value: "Heading "
    - type: Strong
      children:
        - type: Text
          value: bold
      attributes:
        - key: class
          value:
            - b