code: func (p *parser) parseContent() *ast.ContentStatement {
  	// CONTENT
  	tok := p.shift()
  	if tok.Kind != lexer.TokenContent {
  		// @todo This check can be removed if content is optional in a raw block
  		errExpected(lexer.TokenContent, tok)
  	}
  
  	return ast.NewContentStatement(tok.Pos, tok.Line, tok.Val)
  }
docs: // content : CONTENT