lean-ja / lean-ja/lean-by-example
メタプロ：Syntax から Expr 型の値を得る
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メモ
- Dominant language
- Lean
- Stars
- 188
- Forks
- 15
- Avg merge
- 9h 8m
- Merged PRs (30d)
- 6
Description
#eval show Lean.Elab.Term.TermElabM _ from do
let a ← `(?a = 1)
let stx : Syntax ← `($a ∨ ?b)
let expr ← Elab.Term.elabTermAndSynthesize stx none
dbg_trace ← ppExpr expr -- ?a✝ = 1 ∨ ?b✝
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
The issue contains only a Lean snippet using Syntax, Elab.Term.elabTermAndSynthesize, and ppExpr; no repository file or test is named. First locate related metaprogramming examples, then clarify or document the intended result and add an example whose completion criteria explain how Syntax becomes an Expr value.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers, documentation
- Issue type
- Documentation
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 20/100