lean-ja / lean-ja/lean-by-example
notation はダブルバッククォートと同様に quotPrecheck 機能を持つ
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宣言的コマンド
- Dominant language
- Lean
- Stars
- 188
- Forks
- 15
- Avg merge
- 9h 8m
- Merged PRs (30d)
- 6
Description
section
-- エラーになる
local notation s:70 "[" x:70 "↦" n:70 "]" => (fun v => if True then v else v)
end
syntax term "[" term "↦" term "]" : term
section
-- エラーにならない
local macro_rules
| `($s[$x ↦ $n]) => `(fun v ↦ if v = $x then $n else $s v)
end
section
-- エラーになる
local macro_rules
| `($s[$x ↦ $n]) => ``(fun v ↦ if v = $x then $n else $s v)
end
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 two notation and macro_rules examples in the issue and compare the behavior of single and double backquoted quotations. No file or test is named; the issue is resolved when notation provides the same quotPrecheck behavior as double backquotes without the shown error.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100