Steps to reproduce:

- set font-lock level 4 to enable highlighting of function-invocations
- create a new buffer and activate rust-ts-mode

Try writing a function which invokes functions indirectly trough 
field-properties. Example below:

pub fn should_handle(url: String) -> bool {
     if url.ends_with(".css")
        || url.ends_with(".js")
        || url.ends_with(".png")
        || url.ends_with(".jpg")
     {
         false
     } else {
         true
     }
}

Observe that:

- ends_with() is fontified as a property-access, not as a 
function-invocation.
- (plain function invocation is highlighted as expected though)

 From my preliminary inspection of the rust-ts-mode source-code, this 
seems to be because of a very general override later in the file:

rust-ts-mode.el, line 248 or so:

    :language 'rust
    :feature 'property
    :override t
    '((field_identifier) @font-lock-property-face
      (shorthand_field_initializer (identifier) @font-lock-property-face))

Dissabling "override" for this feature fixes the fontification of method 
invocations, but I haven't done enough testing to see if there are other 
unexpected side-effects.

--
Jostein


In GNU Emacs 29.0.60 (build 5, x86_64-pc-linux-gnu, GTK+ Version
  3.24.36, cairo version 1.17.6) of 2023-01-28 built on thinkpad-t14s
Repository revision: 362678d90e10d0e60642cb42594f9e15e39a3a0b
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12201007
System Description: Arch Linux

Configured using:
  'configure --with-json --with-tree-sitter'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY
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TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
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   locale-coding-system: utf-8-unix

Major mode: Rust

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Load-path shadows:
/home/jostein/.emacs.d/elpa/transient-20230107.1528/transient hides 
/home/jostein/build/emacs/lisp/transient

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Memory information:
((conses 16 923748 105144)
  (symbols 48 55100 49)
  (strings 32 257968 16692)
  (string-bytes 1 7664141)
  (vectors 16 115330)
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  (floats 8 1189 588)
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  (buffers 984 86))

-- 
Vennlig hilsen
*Jostein Kjønigsen*

jostein@kjonigsen.net 🍵 jostein@gmail.com
https://jostein.kjønigsen.no <https://jostein.kjønigsen.no>