code: function heading(node) {
    var depth = node.depth + (this.increaseDepth ? 1 : 0)
    var name = depth === 2 ? 'SH' : 'SS'
    var value
  
    if (node === this.mainHeading) {
      return
    }
  
    value = this.all(node).join('')
  
    /* Convert top-level section names to ALL-CAPS. */
    if (name === 'SH') {
      value = value.toUpperCase()
    }
  
    return macro(name, quote(value))
  }
docs: /* Compile a heading.