bug#61303: 29.0.60; rust-ts-mode does not consistently fontify nested macro-invocations

["Jostein Kjønigsen" <jostein@secure.kjonigsen.net>]

Hey there.

Thanks for another tree-sitter based mode to hack at :D

I think I've found an error/lacking in rust-ts-mode where we may have to 
move upstream to fix it.

Consider the following contrived (and yes, not very idiomatic) rust-code:

let result = format!("{}{}",
     "Well yes",
     format!("Or {} no?", "possibly"));

With rust-ts-mode first format! invocation will get highlighted as a 
macro-invocation, while the second will not.

Inspecting this using treesit-explore-mode, I get the following tree:

(let_declaration let pattern: (identifier) =
   value:
    (macro_invocation macro: (identifier) !
     (token_tree (
      (string_literal " ")
      (string_literal " ")
      (identifier)
      (token_tree (
       (string_literal " ")
       (string_literal " ")
       ))
      )))
   ;)

Notice the lack of a second/nested "macro_invocation"-node. Instead the 
second macro is just denoted as a "identifier".

To fix this, we'll probably need to upstream some bug-reports and PRs?

--
Jostein

In GNU Emacs 29.0.60 (build 7, x86_64-pc-linux-gnu, GTK+ Version
  3.24.36, cairo version 1.17.6) of 2023-02-05 built on thinkpad-t14s
Repository revision: 088425538f2122d88a4f4e132dbb2f1139648531
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12201007
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