difftastic/vendor/tree-sitter-hack/test/cases/declarations/function-soft-variadic.exp

(script
  (function_declaration
    name: (identifier)
    (parameters
      (parameter
        (attribute_modifier
          (qualified_identifier
            (identifier)))
        type: (type_specifier)
        (variadic_modifier)
        name: (variable)))
    body: (compound_statement)))