Exception when using DogeGenerate on C function with pointer-to-pointer argument

[mihax86]

When trying to run :DogeGenerate on a C function that has a pointer to pointer parameter, the following exception occurs:

Line: "int main(int argc, char **argv)"

Exception: Vim(return):E491: JSON decode error at 'thread 'main' panicked at src/c/parser.rs:69:38:
called `Option::unwrap()` on a `None` value
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
'

Helper output: thread 'main' panicked at src/c/parser.rs:69:38:
called `Option::unwrap()` on a `None` value
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Error detected while processing function doge#generate[36]..doge#run_parser[55]..function doge#generate[36]..doge#run_p
arser:
line   50:
[vim-doge] c parser failed
Press ENTER or type command to continue

If we modify the sourcecode and change to a simple pointer (char *argv), it works as expected, only when it's a pointer to a pointer (char **argv) that the problem happens.

To Reproduce

Steps to reproduce the behavior:

1. Use the following C code sample:

int main(int argc, char **argv)
{
	return 1;
}

2. Try to DogeGenerate with the cursor at 1,1

Expected behavior

The doxygen comment, not an exception.

Output of ./bin/vim-doge-helper --version

vim-doge-helper 4.7.0

Output of vim --version

VIM - Vi IMproved 9.1 (2024 Jan 02, compiled Jan  8 2025 16:39:01)
Included patches: 1-998
Compiled by laugusto@lab
Huge version without GUI.  Features included (+) or not (-):
+acl               +file_in_path      +mouse_urxvt       -tag_any_white
+arabic            +find_in_path      +mouse_xterm       -tcl
+autocmd           +float             +multi_byte        +termguicolors
+autochdir         +folding           +multi_lang        +terminal
-autoservername    -footer            -mzscheme          +terminfo
-balloon_eval      +fork()            +netbeans_intg     +termresponse
+balloon_eval_term +gettext           +num64             +textobjects
-browse            -hangul_input      +packages          +textprop
++builtin_terms    +iconv             +path_extra        +timers
+byte_offset       +insert_expand     -perl              +title
+channel           +ipv6              +persistent_undo   -toolbar
+cindent           +job               +popupwin          +user_commands
+clientserver      +jumplist          +postscript        +vartabs
+clipboard         +keymap            +printer           +vertsplit
+cmdline_compl     +lambda            +profile           +vim9script
+cmdline_hist      +langmap           -python            +viminfo
+cmdline_info      +libcall           +python3           +virtualedit
+comments          +linebreak         +quickfix          +visual
+conceal           +lispindent        +reltime           +visualextra
+cryptv            +listcmds          +rightleft         +vreplace
+cscope            +localmap          -ruby              +wildignore
+cursorbind        -lua               +scrollbind        +wildmenu
+cursorshape       +menu              +signs             +windows
+dialog_con        +mksession         +smartindent       +writebackup
+diff              +modify_fname      -sodium            +X11
+digraphs          +mouse             -sound             +xattr
-dnd               -mouseshape        +spell             +xfontset
-ebcdic            +mouse_dec         +startuptime       -xim
+emacs_tags        -mouse_gpm         +statusline        +xpm
+eval              -mouse_jsbterm     -sun_workshop      +xsmp_interact
+ex_extra          +mouse_netterm     +syntax            +xterm_clipboard
+extra_search      +mouse_sgr         +tag_binary        -xterm_save
-farsi             -mouse_sysmouse    -tag_old_static
   system vimrc file: "$VIM/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
 3rd user vimrc file: "~/.config/vim/vimrc"
      user exrc file: "$HOME/.exrc"
       defaults file: "$VIMRUNTIME/defaults.vim"
  fall-back for $VIM: "/usr/local/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -g -O2 -D_REENTRANT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: gcc -L/usr/local/lib -Wl,--as-needed -o vim -lSM -lICE -lXpm -lXt -lX11 -lXdmcp -lSM -lICE -lm -ltinfo -lrt -ldl -L/usr/lib/python3.8/config-3.8-x86_64-linux-gnu -lpython3.8 -lcrypt -lpthread -ldl -lutil -lm -lm