Toml task documentation example does not work

[jdx]

Discussed in #3983

^{Originally posted by gturi January 7, 2025}
I was trying out toml task with usage definition. I slightly modified the command in the example https://mise.jdx.dev/tasks/toml-tasks.html#usage-spec and put it into my config.toml

config.toml

[tasks.test]
usage = '''
arg "file" description="The file to test" default="src/main.rs"
'''
run = 'echo {{arg(name="file")}}'

When I run mise run test hello I get the following error:

[test] ERROR 
   0: Invalid usage config

Location:
   src/task/task_script_parser.rs:305

Backtrace omitted. Run with RUST_BACKTRACE=1 environment variable to display it.
Run with RUST_BACKTRACE=full to include source snippets.
[test] ERROR task failed

mise doctor output:

version: 2025.1.1 linux-x64 (dba7044 2025-01-06)
activated: yes
shims_on_path: no

build_info:
  Target: x86_64-unknown-linux-gnu
  Features: DEFAULT, NATIVE_TLS, OPENSSL
  Built: Mon, 6 Jan 2025 08:26:44 +0000
  Rust Version: rustc 1.83.0 (90b35a623 2024-11-26)
  Profile: release

shell:
  zsh
  zsh 5.9 (x86_64-redhat-linux-gnu)

dirs:
  cache: ~/.cache/mise
  config: ~/.config/mise
  data: ~/.local/share/mise
  shims: ~/.local/share/mise/shims
  state: ~/.local/state/mise

config_files:
  ~/.config/mise/config.toml

ignored_config_files: (none)

backends:
  aqua
  asdf
  cargo
  core
  dotnet
  gem
  go
  npm
  pipx
  spm
  ubi
  vfox

plugins:

toolset:
  ubi:jdx/[email protected]

path:
  ~/.local/share/mise/installs/usage/1.7.4/bin
  /run/user/1000/fnm_multishells/29267_1736283979698/bin
  ~/.local/share/fnm
  /run/user/1000/fnm_multishells/7688_1736270230265/bin
  ~/.local/share/fnm
  /run/user/1000/fnm_multishells/7685_1736270230230/bin
  ~/.local/share/fnm
  ~/.local/bin
  ~/bin
  /usr/local/bin
  /usr/bin
  /bin
  /usr/local/sbin
  /usr/sbin
  /sbin
  ~/.local/share/JetBrains/Toolbox/scripts
  /var/lib/snapd/snap/bin
  ~/Programs/go/bin
  ~/.jdks/temurin-21.0.4/bin
  ~/Programs/gradle-8.10/bin
  ~/.local/share/JetBrains/Toolbox/scripts
  ~/Programs/go/bin
  ~/.jdks/temurin-21.0.4/bin
  ~/Programs/gradle-8.10/bin

env_vars:
  MISE_SHELL=zsh

settings:

No problems found
```</div>