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Status: Open.

#13694 In leanprover/lean4;

· Sol-Ell opened on May 10, 2026

mconstructor / mleft is incompatible with mhave's state

bugSomething isn't workingSomething isn't working

Status: Open.

#13691 In leanprover/lean4;

· mirefek opened on May 8, 2026

Eta-expansion through Subtype

bugSomething isn't workingSomething isn't working

code-generatorThis issue is with the code generatorThis issue is with the code generator

Status: Open.

#13685 In leanprover/lean4;

· sgraf812 opened on May 7, 2026

RFC: tracking panic freedom

RFCRequest for commentsRequest for comments

Status: Open.

#13659 In leanprover/lean4;

· Kha opened on May 6, 2026

grind canonicalizer creates closed term with proof lacking nestedProof

bugSomething isn't workingSomething isn't working

Status: Open.

#13655 In leanprover/lean4;

· datokrat opened on May 6, 2026

feat: add Dyadic.divAtPrec for round-down dyadic division at given precision

Status: Open.

#13653 In leanprover/lean4;

· kim-em opened on May 6, 2026

Setting -D Elab.async=false breaks backward.privateInPublic

bugSomething isn't workingSomething isn't working

Status: Open.

#13647 In leanprover/lean4;

· yhx-12243 opened on May 5, 2026

RFC: Redesign of Lean FS API

RFCRequest for commentsRequest for comments

Status: Open.

#13638 In leanprover/lean4;

· algebraic-dev opened on May 5, 2026

LCNF simplifier scales super-linearly

bugSomething isn't workingSomething isn't working

code-generatorThis issue is with the code generatorThis issue is with the code generator

P-mediumWe may work on this issue if we find the timeWe may work on this issue if we find the time

Status: Open.

#13632 In leanprover/lean4;

· sgraf812 opened on May 4, 2026

shake --fix non-idempotency caused when modules are loaded via IR

bugSomething isn't workingSomething isn't working

Status: Open.

#13599 In leanprover/lean4;

· bryangingechen opened on May 1, 2026

simp? returns unuseful lemmas

bugSomething isn't workingSomething isn't working

Status: Open.

#13592 In leanprover/lean4;

· b-mehta opened on May 1, 2026

lia fails with "(kernel) application type mismatch"

bugSomething isn't workingSomething isn't working

Status: Open.

#13572 In leanprover/lean4;

· andres-erbsen opened on Apr 29, 2026