Regression in whitespace-insensitive tactic parsing
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P-low
- Dominant language
- Lean
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Description
example : True := by { skip;
trivial }
fails with a parse error unless the indentation of trivial is greater or equal to the column of skip. cc: @gebner (since this is almost certainly fallout of #1612 and #1622)
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the Lean example and inspect the tactic parser behavior around whitespace and indentation. Review the fallout referenced from #1612 and #1622, then verify that trivial parses regardless of whether its indentation is less than skip.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100