lean-ja / lean-ja/lean-by-example
`guard_target` を紹介する
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タクティク
- Dominant language
- Lean
- Stars
- 188
- Forks
- 15
- Avg merge
- 9h 8m
- Merged PRs (30d)
- 6
Description
いままでゴールの状態をチェックするのに show を使っていたが, show は定義上等しい変形を許してしまい，正確なゴール変形を示すことはできない．たとえば dsimp によるゴール状態の変化はチェックできない．
guard_target は構文的に等しいかどうかをチェックできるので，より精密なゴール状態のアサートができる．既存の show によるコードを置き換えることも検討すべき
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 locating the existing examples that use show to check goal states. Document guard_target as the more precise option for syntactic target checks, and consider replacing the relevant show examples. Done means the examples explain the distinction and accurately demonstrate the intended goal-state assertions.
Written by the indexing model from the issue text.
Assessment
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100