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Segfault on Lean 4.29.1 (stable) on apple silicon.

bugSomething isn't workingSomething isn't working

Status: Open.

#13407 In leanprover/lean4;

· d0nutptr opened on Apr 14, 2026

Significant performance regression going from 4.27 to 4.28 on project kmill/lean4-raytracer

bugSomething isn't workingSomething isn't working

Status: Open.

#13383 In leanprover/lean4;

· philnguyen opened on Apr 13, 2026

Missing inverse lemmas for Float.ofBits / Float.toBits

Status: Open.

#13369 In leanprover/lean4;

· kjsdesigns opened on Apr 10, 2026

Failure to generate equality theorem for matcher

bugSomething isn't workingSomething isn't working

Status: Open.

#13364 In leanprover/lean4;

· arthur-adjedj opened on Apr 10, 2026

LCNF ReduceArity should also work for non-fix unused arguments.

bugSomething isn't workingSomething isn't working

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

Status: Open.

#13355 In leanprover/lean4;

· hargoniX opened on Apr 10, 2026

Unused variable linter false positives

bugSomething isn't workingSomething isn't working

Status: Open.

#13354 In leanprover/lean4;

· TwoFX opened on Apr 10, 2026

resolveUniqueNamespace fails even when all namespace resolution candidates are equal

bugSomething isn't workingSomething isn't working

Status: Open.

#13353 In leanprover/lean4;

· thorimur opened on Apr 9, 2026

RFC: expand reducibility warning about class-typed defs

RFCRequest for commentsRequest for comments

Status: Open.

#13351 In leanprover/lean4;

· SnirBroshi opened on Apr 9, 2026

RFC: specify --packages to lake using an environment variable

RFCRequest for commentsRequest for comments

Status: Open.

#13344 In leanprover/lean4;

· xhalo32 opened on Apr 9, 2026

feat: lake build --summary flag to print build outcome table

changelog-lakeLakeLake

Status: Open.

#13316 In leanprover/lean4;

· kim-em opened on Apr 8, 2026

deriving BEq inside public meta section does not produce a meta instance

Status: Open.

#13313 In leanprover/lean4;

· kim-em opened on Apr 8, 2026

CMakeLists logic misses aarch leantar

bugSomething isn't workingSomething isn't working

Status: Open.

#13306 In leanprover/lean4;

· mattrobball opened on Apr 7, 2026