StubLinter.lean`

Explanation legend Lean4 Domain Explanation Language (L4DEL)

L4DEL explanations are a separate layer. They do not change the Lean source. Intuition is explanatory prose; numbered items are a reading path; sources link the wording back to evidence.

L4DEL: Lean4 Domain Explanation Language

Annotation provenance. This overlay contains 10 curated AI-written annotations and 7190 mechanical source-derived annotations. They have not been human-reviewed as explanations; treat them as unverified and not mathematical authority. Retained generation history: The 71 original curated annotations were produced in a Claude Sonnet 5.5 session at medium effort; Claude Opus 5.5 is recorded in that session as the advisor model, not the direct author. The bulk source-derived expansion was generated mechanically from pinned source comments by tooling developed in a GPT-5.6 Sol session at ultra reasoning; GPT-5.6 Sol did not originate the quoted source prose. On 2026-10-17 the mechanically generated source-comment annotations of the Formal Conjectures, Carleson, FLT, PFR, CompFiles, Mathematics in Lean and Theorem Proving in Lean overlays were regenerated by the same generator after three corrections made in a Claude Sonnet 5.5 session: titles no longer cut a sentence inside mathematics or end on a dangling word, workflow markers are removed from the quoted prose, and declaration names follow the scanner's namespace resolution. The boilerplate step line was dropped, and comments that were only a row of dashes no longer yield annotations. No new prose was written and no human review is claimed.

Credit: The upstream authors and contributors retain credit for the project and mathematics. lean4-explainer only renders their pinned source and adds the separately disclosed explanation layer.

Project sources: Pinned project documentation, Formal Conjectures paper, arXiv v1

3 declarations, 1 contain sorry, 0 declared as axioms

The Stub Linter

The StubLinter ensures that no stubs, placeholder definitions (e.g. opaque, def ... := sorry), or new axioms are introduced in the repository.

Imports (1)

Mathlib.Tactic.Linter.Header

Imported by 1 file

FormalConjecturesUtil.lean

def StubLinter.hasSorry Checks whether a syntax node contains sorry, admit, or sorryAx sorry line 38 source
Source documentation
Checks whether a syntax node contains sorry, admit, or sorryAx.

no axioms what this means
Statement uses: Lean.Syntax, Bool
Proof uses: bne, Option, Lean.Syntax.find?, Bool.or, Lean.Syntax.isOfKind, Lean.Name.mkStr4, Bool.and, Lean.Syntax.isIdent, BEq.beq, Lean.Name, Lean.Syntax.getId, Lean.Name.mkStr1, Lean.Name.eraseMacroScopes, Option.none
3 instances, coercions and auxiliary constants left out.
```
def hasSorry (stx : Syntax) : Bool :=
…
```
def StubLinter.checkDecl Checks a declaration command for stubs, placeholder definitions, and axioms line 48 source
Source documentation
Checks a declaration command for stubs, placeholder definitions, and axioms.

standard axioms: Classical.choice, Quot.sound, propext what this means
Statement uses: Lean.Syntax, Lean.Elab.Command.CommandElabM, Unit
Proof uses: ite, Eq, Bool, BEq.beq, Lean.SyntaxNodeKind, Lean.Syntax.getKind, Lean.Name.mkStr4, Bool.true, GetElem.getElem, Nat, True, OfNat.ofNat, True.intro, Lean.Linter.logLintIf, linter.style.stubs, Function.comp, String, Std.Format, Lean.MessageData, Lean.MessageData.ofFormat and 11 more
14 instances, coercions and auxiliary constants left out.
```
def checkDecl (stx : Syntax) : CommandElabM Unit := do
…
```
def StubLinter.stubLinter The stub linter checks that no opaque, axiom, or `def line 67 source
Source documentation
The stub linter checks that no opaque, axiom, or def ... := sorry definitions are present.

standard axioms: Classical.choice, Quot.sound, propext what this means
Statement uses: Lean.Elab.Command.Linter
Proof uses: Lean.Elab.Command.Linter.mk, Lean.withSetOptionIn, Lean.Syntax, ite, Lean.Elab.Command.CommandElabM, Unit, Eq, Bool, BEq.beq, Lean.SyntaxNodeKind, Lean.Syntax.getKind, Lean.Name.mkStr4, Bool.true, Bind.bind, PUnit, ForIn.forIn, Array, inferInstance, Membership, Lean.Syntax.getArgs and 18 more
13 instances, coercions and auxiliary constants left out.
```
def stubLinter : Linter where
…
```