Multiple Terraform platforms in pants.toml results in invalid config

[d-m]

Describe the bug
Adding

[download-terraform]
platforms = ["darwin_amd64", "linux_amd64"]

to the pants.toml results in:

$ pants --print-stacktrace experimental-deploy ::
17:12:08.03 [INFO] Initializing scheduler...
17:12:10.93 [INFO] Scheduler initialized.
17:12:10.98 [ERROR] Invalid option 'platforms' under [download-terraform] in /Documents/git/pants.toml
17:12:10.98 [ERROR] Invalid config entries detected. See log for details on which entries to update or remove.

(Specify --no-verify-config to disable this check.)
Traceback (most recent call last):
  File "/Library/Caches/nce/6faa4322d1df41d032e4938795c6f2c262ab92bb642a9bac1101cb7d1631f9c1/bindings/venvs/2.21.0/lib/python3.9/site-packages/pants/bin/daemon_pants_runner.py", line 134, in single_daemonized_run
    runner = LocalPantsRunner.create(
  File "/Library/Caches/nce/6faa4322d1df41d032e4938795c6f2c262ab92bb642a9bac1101cb7d1631f9c1/bindings/venvs/2.21.0/lib/python3.9/site-packages/pants/bin/local_pants_runner.py", line 113, in create
    options.verify_configs(options_bootstrapper.config)
  File "/Library/Caches/nce/6faa4322d1df41d032e4938795c6f2c262ab92bb642a9bac1101cb7d1631f9c1/bindings/venvs/2.21.0/lib/python3.9/site-packages/pants/option/options.py", line 246, in verify_configs
    global_config.verify(section_to_valid_options)
  File "/Library/Caches/nce/6faa4322d1df41d032e4938795c6f2c262ab92bb642a9bac1101cb7d1631f9c1/bindings/venvs/2.21.0/lib/python3.9/site-packages/pants/option/config.py", line 104, in verify
    raise ConfigValidationError(
pants.option.errors.ConfigValidationError: Invalid config entries detected. See log for details on which entries to update or remove.

(Specify --no-verify-config to disable this check.)

Use -ldebug for more logs. 
See https://www.pantsbuild.org/2.21/docs/using-pants/troubleshooting-common-issues for common issues.
Consider reaching out for help: https://www.pantsbuild.org/community/getting-help

Pants version
Which version of Pants are you using?
2.21.0

OS
MacOS

[benjyw]

AFAICT the download-terraform subsystem has no option by that name: https://www.pantsbuild.org/stable/reference/subsystems/download-terraform
So the error is unsurprising.

What is the underlying thing you're trying to achieve?

[d-m]

My mistake, I was looking at the prerelease documentation at http://www.pantsbuild.org/prerelease/reference/subsystems/download-terraform#platforms.

This should allow us to create terraform lockfiles that include hashes for multiple architectures.

[lilatomic]

[download-terraform].platforms made it into 2.23 . That release is currently at rc0, so it should be stable enough to try out.