Support for GNU Makefiles: swap function arguments

I would like to use the module swap for GNU Make function arguments. An example is

$(foreach ext, $(CLEAN_EXTS), $(docs:%.$(FORMAT)=%.$(ext)))

https://www.gnu.org/software/make/manual/html_node/Syntax-of-Functions.html

with the syntax tree:

function_call [0, 0] - [0, 59]
  arguments [0, 10] - [0, 58]
    argument: text [0, 10] - [0, 58]
      variable_reference [0, 15] - [0, 28]
        word [0, 17] - [0, 27]
      substitution_reference [0, 30] - [0, 58]
        text: word [0, 32] - [0, 36]
        pattern: concatenation [0, 37] - [0, 48]
          word [0, 37] - [0, 39]
          variable_reference [0, 39] - [0, 48]
            word [0, 41] - [0, 47]
        replacement: concatenation [0, 49] - [0, 57]
          word [0, 49] - [0, 51]
          variable_reference [0, 51] - [0, 57]
            word [0, 53] - [0, 56]

Could I use the mappings <leader>a and <leader>A to swap arguments?

Note the first argument is delimited on the left with whitespace and the last argument is delimited on the right with ). All others are surrounded with ,.

My current textobjects.scm is based on other files in this repository without much understanding.

((arguments
  "," @_start . (_) @parameter.inner)
 (#make-range! "parameter.outer" @_start @parameter.inner))
((arguments
  . (_) @parameter.inner . ","? @_end)
  (#make-range! "parameter.outer" @parameter.inner @_end))

And it throws an error when I press <leader>a

|| E5108: Error executing lua: ...ter-textobjects/lua/nvim-treesitter/textobjects/swap.lua:11: bad argument #1 to 'ipairs' (table expected, got nil)
|| stack traceback:
|| 	[C]: in function 'ipairs'
|| 	...ter-textobjects/lua/nvim-treesitter/textobjects/swap.lua:11: in function 'swap_textobject'
|| 	...ter-textobjects/lua/nvim-treesitter/textobjects/swap.lua:34: in function <...ter-textobjects/lua/nvim-treesitter/textobjects/swap.lua:32>
|| 	...r-textobjects/lua/nvim-treesitter/textobjects/attach.lua:28: in function <...r-textobjects/lua/nvim-treesitter/textobjects/attach.lua:27>

Start with the supplied textobjects.scm query and lua/nvim-treesitter/textobjects/swap.lua, then inspect lua/nvim-treesitter/textobjects/attach.lua to understand how swap mappings receive captures. Reproduce the GNU Make example and its syntax tree, and consider the issue complete when the swap mappings work for the first, middle, and last arguments without the reported Lua error.