leanprover / leanprover/lean4

RFC: `lake run` with no default script should fail

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Lake P-medium RFC
Dominant language
Lean
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Description

lake run --help says "A bare lake run command will run the default script(s) of the root package".

However if I run lake run in a project with no scripts at all, it returns silently with exit code 0. Should it instead indicate that something is wrong?

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing lake run in a project with no scripts and compare its behavior with the promise in lake run --help. Trace the lake run entry point and existing command tests, then make the no-script case report an error with a nonzero exit status if that behavior is accepted.

Written by the indexing model from the issue text.

Assessment

Domain
cli
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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