:DartFmt is giving and error and does nothing

[Chaitanyabsprip]

this is the error it is giving.

I am using Windows 10.

Vim version

MS-Windows 64-bit console version
Included patches: 1-2127
Compiled by appveyor@APPVYR-WIN
Huge version without GUI.  Features included (+) or not (-):
+acl                +ex_extra           +multi_lang         +tcl/dyn
+arabic             +extra_search       +mzscheme/dyn       +termguicolors
+autocmd            -farsi              -netbeans_intg      +terminal
+autochdir          +file_in_path       +num64              -termresponse
+autoservername     +find_in_path       +packages           +textobjects
-balloon_eval       +float              +path_extra         +textprop
+balloon_eval_term  +folding            +perl/dyn           -tgetent
-browse             -footer             +persistent_undo    +timers
++builtin_terms     +gettext/dyn        +popupwin           +title
+byte_offset        -hangul_input       -postscript         -toolbar
+channel            +iconv/dyn          +printer            +user_commands
+cindent            +insert_expand      +profile            +vartabs
+clientserver       +ipv6               +python/dyn         +vertsplit
+clipboard          +job                +python3/dyn        +virtualedit
+cmdline_compl      +jumplist           +quickfix           +visual
+cmdline_hist       +keymap             +reltime            +visualextra
+cmdline_info       +lambda             +rightleft          +viminfo
+comments           +langmap            +ruby/dyn           +vreplace
+conceal            +libcall            +scrollbind         +vtp
+cryptv             +linebreak          +signs              +wildignore
+cscope             +lispindent         +smartindent        +wildmenu
+cursorbind         +listcmds           +sound              +windows
+cursorshape        +localmap           +spell              +writebackup
+dialog_con         +lua/dyn            +startuptime        -xfontset
+diff               +menu               +statusline         -xim
+digraphs           +mksession          -sun_workshop       -xpm_w32
-dnd                +modify_fname       +syntax             -xterm_save
-ebcdic             +mouse              +tag_binary
+emacs_tags         -mouseshape         -tag_old_static
+eval               +multi_byte_ime/dyn -tag_any_white
   system vimrc file: "$VIM\vimrc"
     user vimrc file: "$HOME\_vimrc"
 2nd user vimrc file: "$HOME\vimfiles\vimrc"
 3rd user vimrc file: "$VIM\_vimrc"
      user exrc file: "$HOME\_exrc"
  2nd user exrc file: "$VIM\_exrc"
       defaults file: "$VIMRUNTIME\defaults.vim"
Compilation: cl -c /W3 /nologo  -I. -Iproto -DHAVE_PATHDEF -DWIN32  -DFEAT_CSCOPE -DFEAT_TERMINAL -DFEAT_SOUND  -DFEAT_JOB_CHANNEL -DFEAT_IPV6      -DWINVER=0x0501 -D_WIN32_WINNT=0x0501 /source-charset:utf-8 /MP -DHAVE_STDINT_H /Ox /GL -DNDEBUG  /Zl /MT /D_CRT_SECURE_NO_DEPRECATE /D_CRT_NONSTDC_NO_DEPRECATE -DFEAT_MBYTE_IME -DDYNAMIC_IME -DDYNAMIC_ICONV -DDYNAMIC_GETTEXT -DFEAT_TCL -DDYNAMIC_TCL -DDYNAMIC_TCL_DLL=\"tcl86t.dll\" -DDYNAMIC_TCL_VER=\"8.6\" -DFEAT_LUA -DDYNAMIC_LUA -DDYNAMIC_LUA_DLL=\"lua53.dll\" -DFEAT_PYTHON -DDYNAMIC_PYTHON -DDYNAMIC_PYTHON_DLL=\"python27.dll\" -DFEAT_PYTHON3 -DDYNAMIC_PYTHON3 -DDYNAMIC_PYTHON3_DLL=\"python38.dll\" -DFEAT_MZSCHEME -I "C:\Program Files\Racket\include" -DMZ_PRECISE_GC -DDYNAMIC_MZSCHEME -DDYNAMIC_MZSCH_DLL=\"libracket3m_a36fs8.dll\" -DDYNAMIC_MZGC_DLL=\"libracket3m_a36fs8.dll\" -DFEAT_PERL -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DDYNAMIC_PERL -DDYNAMIC_PERL_DLL=\"perl528.dll\" -DFEAT_RUBY -DDYNAMIC_RUBY -DDYNAMIC_RUBY_DLL=\"x64-msvcrt-ruby240.dll\" -DRUBY_VERSION=24 -DFEAT_HUGE /Fd.\ObjCULYHTRZAMD64/ /Zi
Linking: link  /nologo /opt:ref /LTCG:STATUS oldnames.lib kernel32.lib advapi32.lib shell32.lib gdi32.lib  comdlg32.lib ole32.lib netapi32.lib uuid.lib /machine:AMD64   libcmt.lib  user32.lib  /nodefaultlib:lua53.lib  /STACK:8388608  /nodefaultlib:python27.lib /nodefaultlib:python38.lib   "C:\Tcl\lib\tclstub86.lib" winmm.lib WSock32.lib Ws2_32.lib /PDB:vim.pdb -debug```

[natebosch]

This appears to be a general vim issue. My expectation is that any call to systemlist() with an input argument will see this issue.

The docs for :help system say: "When {input} is given and is a string this string is written to a file and passed as stdin to the command."

If there is a problem using temp files to pass the stdin, or perhaps reading for the stdout, then you'd see a problem like this.

You should be able to verify this is the problem by running :echo system('cat', 'foo') (or similar, this assumes you have a cat executable in your path) and verify you can get the output. Assuming that has an error you will need to get help from the vim project maintainers.

For instance there may be an issue with setting the shell setting. See https://stackoverflow.com/questions/11629484/vim-temporary-files-with-native-vim-on-windows