leanprover-community/repl

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A simple REPL for Lean 4, returning information about errors and sorries.

Stars: 228
Forks: 69
Open beginner issues: 0
Indexed issues: 26
Avg merge: 15m
Merged PRs (30d): 4

Dominant language: Lean
License: Apache-2.0
Last GitHub push: Sep 16, 2026
Latest indexed: Sep 18, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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26 open issues indexed

proofStep discards the message log on failure, so elaboration errors surface only as `internal exception #N` Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

leanprover-community/repl#164 · Opened Aug 8, 2026
Uncompatible lean version for different libraries Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/repl#125 · 1 comment · Opened Aug 11, 2025
[proposal]Make request parsing more robust Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

leanprover-community/repl#122 · Opened Jul 15, 2025
Want to parse ast even in invalid proof. Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

leanprover-community/repl#118 · Opened Jul 6, 2025
Lean Repl unable to run with canonical Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/repl#115 · 16 comments · Opened Jul 1, 2025
Local instances not captured correctly in term sorries Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

leanprover-community/repl#107 · Opened Jun 27, 2025
[feature request] Option for pickling imported environment completely, not just diff from imports - so that they can be recovered fast in one command without re-doing the fully-fledged imports Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

leanprover-community/repl#95 · 2 reactions · Opened Apr 29, 2025
[feature request] Built-in command timeout support Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

leanprover-community/repl#94 · 1 comment · Opened Apr 29, 2025
CPU usage Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

leanprover-community/repl#91 · 1 comment · Opened Apr 22, 2025
Fork safety Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

leanprover-community/repl#87 · 2 comments · 1 reaction · Opened Apr 18, 2025
How to solve the input issue of the v4.8 repl server? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

leanprover-community/repl#86 · 1 comment · Opened Apr 17, 2025
Server mode Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

leanprover-community/repl#84 · 12 comments · Opened Apr 15, 2025
INTERNAL PANIC: Error when Pickling Proof State Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/repl#81 · Opened Apr 7, 2025
LeanRepl terminates trying to run large amounts of commands on a single LeanRepl instance Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/repl#77 · 29 comments · Opened Mar 29, 2025
information returned by repl is inconsistent with the information returned by lean info. Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

leanprover-community/repl#76 · 4 comments · Opened Mar 4, 2025
pattern-matching in theorem signature causes `unknown constant 'foo.match_1'` Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover-community/repl#66 · 1 comment · Opened Jan 8, 2025
Pickling-unpickling an environment makes definitions noncomputable? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/repl#62 · Opened Dec 15, 2024
Goals of tactics often lose line breaks Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

leanprover-community/repl#58 · Opened Oct 12, 2024
[Question] (automatically) Including imports Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

leanprover-community/repl#53 · Opened Aug 9, 2024
[BUG] REPL accepts incorrect proofs Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

leanprover-community/repl#44 · 36 comments · Opened May 29, 2024
Issues while executing tactics with `;` in them. Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

leanprover-community/repl#43 · 2 comments · Opened May 27, 2024
Bugs for metavariable '?[anonymous]' when setting "allTactics" as true Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

leanprover-community/repl#42 · 2 comments · Opened May 26, 2024
Failed to input the tactics step-by-step within a case block Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover-community/repl#25 · 3 comments · Opened Dec 18, 2023
Repl doesn't return any output? Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover-community/repl#16 · 7 comments · Opened Oct 30, 2023
Iterative execution of proofs Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

leanprover-community/repl#6 · 2 comments · Opened May 2, 2023
Sorry reporting should pick up term mode sorries as well. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover-community/repl#4 · Opened Apr 4, 2023

leanprover-community/repl

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