bug#62315: 30.0.50; [BUG] Rust eglot tuple struct field completion

[Ruijie Yu]

CC'ing João because eglot.  Thanks.

> I can't word it, so let me explain via an example.  The Emacs in
> question was built a few days ago, FTR.
>
> Also, note that I am using rust-ts-mode as the major mode, since
> it is the only builtin rust major mode, with the corresponding grammar
> lib cloned and built moments ago.
>
> $ cd "$(mktemp -d)"
> $ cargo init --name foo --lib
> $ emacs -Q src/lib.rs
>
> Replace src/lib.rs with the following content, then revert buffer and
> run `eglot':
>
> //  -*- mode: rust-ts; -*-
> /// 0..=10
> #[derive(Default)]
> struct Foo(u32, u32, u32, u32, u32, u32, u32, u32, u32, u32, u32);
>
> fn foo(f: Foo) -> u32 {
>     f.
> }
>
>
> Put point after "f.", and type any number between (inclusive) 0 and 10,
> and type TAB.  Observe that the number is repeated.  This even happens
> with 1, where I expect to have "10" as a completion candidate.
>
> I use a rather large tuple struct in this example because I want to
> demonstrate that this issue should be happening for all magnitude of
> tuple indices, not just a single digit.
>
> In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
>  3.24.37, cairo version 1.17.8) of 2023-03-11 built on fw.net.yu
> Repository revision: c6bfffa9fe1af7f4f806e5533ba5f3c33476cf9a
> Repository branch: master
> System Description: Arch Linux
>
> Configured using:
>  'configure --with-pgtk'
>
> Configured features:
> ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
> JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PGTK
> PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
> TREE_SITTER WEBP XIM GTK3 ZLIB
>
> Important settings:
>   value of $LANG: en_US.UTF-8
>   value of $XMODIFIERS: @im=fcitx
>   locale-coding-system: utf-8-unix
>
> Major mode: Rust
>
> Minor modes in effect:
>   eglot-inlay-hints-mode: t
>   eglot--managed-mode: t
>   flymake-mode: t
>   text-scale-mode: t
>   tooltip-mode: t
>   global-eldoc-mode: t
>   eldoc-mode: t
>   show-paren-mode: t
>   electric-indent-mode: t
>   mouse-wheel-mode: t
>   tool-bar-mode: t
>   menu-bar-mode: t
>   file-name-shadow-mode: t
>   global-font-lock-mode: t
>   font-lock-mode: t
>   blink-cursor-mode: t
>   line-number-mode: t
>   transient-mark-mode: t
>   auto-composition-mode: t
>   auto-encryption-mode: t
>   auto-compression-mode: t
>
> Load-path shadows:
> None found.
>
> Features:
> (shadow sort mail-extr emacsbug message mailcap yank-media puny dired
> dired-loaddefs rfc822 mml mml-sec epa derived epg rfc6068 epg-config
> gnus-util mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
> gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
> mail-prsvr mail-utils time-date cl-extra eglot external-completion array
> filenotify jsonrpc ert pp ewoc debug backtrace find-func xref
> flymake-proc flymake warnings icons compile text-property-search comint
> ansi-osc ansi-color ring url-util url-parse auth-source eieio eieio-core
> cl-macs password-cache json subr-x map url-vars project byte-opt gv
> bytecomp byte-compile imenu pcase rust-ts-mode rx c-ts-common treesit
> cl-seq thingatpt help-fns radix-tree help-mode files-x format-spec
> face-remap vc-git diff-mode easy-mmode vc-dispatcher cl-loaddefs cl-lib
> rmc iso-transl tooltip cconv eldoc paren electric uniquify ediff-hook
> vc-hooks lisp-float-type elisp-mode mwheel term/pgtk-win pgtk-win
> term/common-win pgtk-dnd tool-bar dnd fontset image regexp-opt fringe
> tabulated-list replace newcomment text-mode lisp-mode prog-mode register
> page tab-bar menu-bar rfn-eshadow isearch easymenu timer select
> scroll-bar mouse jit-lock font-lock syntax font-core term/tty-colors
> frame minibuffer nadvice seq simple cl-generic indonesian philippine
> cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
> korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
> european ethiopic indian cyrillic chinese composite emoji-zwj charscript
> charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure
> cl-preloaded button loaddefs theme-loaddefs faces cus-face macroexp
> files window text-properties overlay sha1 md5 base64 format env
> code-pages mule custom widget keymap hashtable-print-readable backquote
> threads dbusbind inotify dynamic-setting system-font-setting
> font-render-setting cairo gtk pgtk lcms2 multi-tty make-network-process
> emacs)


--
Best,


RY