Invalid YAML generated when formatting a file with comments

[wojciechka]

Ran into an error with yam when working on a YAML manifest for a package that had multiple comments.

Minimal YAML file to reproduce the issue:

package:
  name: example
  version: 0.0.1
  epoch: 0
  description: Example app
pipeline:
  - uses: git-checkout
    with:
      repository: https://github.com/example/example
      tag: v${{package.version}}
      expected-commit: testabc
  # NOTE: commented out command
  # - runs: |
  #     make target

  - uses: go/build
    with:
      tags: "test"

This has an entire element in the pipeline commented out. After yam, this is formatted as:

package:
  name: example
  version: 0.0.1
  epoch: 0
  description: Example app

pipeline:
  - uses: git-checkout
    with:
      repository: https://github.com/example/example
      tag: v${{package.version}}
      expected-commit: testabc

  - uses
    # NOTE: commented out command
    # - runs: |
    #     make target: go/build
    with:
      tags: "test"

Which is an invalid YAML file.

Similar error happened in a run for linter in https://github.com/wolfi-dev/os here: https://github.com/wolfi-dev/os/actions/runs/11252322016/job/31285172681