Why3

A structured dataset of lemmas, functions, and predicates from Why3, a platform for deductive program verification.

Source

• Repository: https://gitlab.inria.fr/why3/why3
• Commit: 7c59064b4eed9a4059292599f3a657716aa34784
• Files: 522
• License: lgpl-2.1

Schema

Column	Type	Description
statement	string	Declaration signature/claim with the leading keyword removed (verbatim slice); the full declaration minus its proof
proof	string	Verbatim proof/body, empty if the declaration has none
type	string	Declaration keyword
symbolic_name	string	Declaration identifier
library	string	Sub-library
filename	string	Repository-relative source path
imports	list[string]	File-level Require/Import modules
deps	list[string]	Intra-corpus identifiers referenced
docstring	string	Preceding documentation comment, empty if absent
source_url	string	Upstream repository
commit	string	Upstream commit extracted

Statistics

• Entries: 9,558
• With proof: 4,842 (50.7%)
• With docstring: 1,642 (17.2%)
• Libraries: 21

By type

Type	Count
let	1,576
lemma	1,437
predicate	933
axiom	894
function	881
val	753
goal	687
let lemma	662
type	560
constant	336
let function	300
val function	179
let constant	84
val constant	78
let predicate	62
inductive	56
exception	44
val predicate	36

Example

array [@extraction:array] 'a
= private {
    mutable ghost elts : int -> 'a;
                length : int
  } invariant { 0 <= length }

• type: type | symbolic_name: array | stdlib/array.mlw

Use

Each declaration is split into a statement (signature/claim) and a proof (body) that are disjoint and together form the complete declaration, for proof modeling, autoformalization, retrieval, and dependency analysis via deps.

Citation

@misc{why3_dataset,
  title  = {Why3},
  author = {Norton, Charles},
  year   = {2026},
  note   = {Extracted from https://gitlab.inria.fr/why3/why3, commit 7c59064b4eed},
  url    = {https://huggingface.co/datasets/phanerozoic/Why3}
}