bug#74277: 29.4; rust-ts-mode doesn't highlight some function calls

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 08 Nov 2024 20:24:07 +0000
> From: acidbong--- via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> rust-ts-mode highlights function calls when they're used in an
> assignment or as statements, but not in string formatting:
> 
> 
> ```
> println!("Some line and {}", some_function(a, b))
>                            # ^^^^^^^^^^^^^ this is not getting highlighted
> ```
> 
> This is how it looks in Emacs (treesit-level is 4 btw):
> https://matrix.envs.net/_matrix/media/r0/download/envs.net/66652827fc7545e57d2eef263ee28ef6bc2ef1c01854976160883015680
> 
> This is how it looks in Neovim (with treesitter highlighting on):
> https://matrix.envs.net/_matrix/media/r0/download/envs.net/382a104ee3e6e4dacabebfa7f84f4b9b7231b1171854976151936565248
> 
> -----------------------------------

Thanks.

Randy/Yuan, any suggestions or fixes?