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Typeclass search loops with outParam and inheritance

bugSomething isn't workingSomething isn't working

Status: Open.

#13038 In leanprover/lean4;

· gasparattila opened on Mar 22, 2026

Panic trying to compile mutually recursive definitions

bugSomething isn't workingSomething isn't working

Status: Open.

#13015 In leanprover/lean4;

· denis-protivensky opened on Mar 20, 2026

Lake: multiple lean_exe targets with the same root module name produce identical executables

bugSomething isn't workingSomething isn't working

LakeLake related issueLake related issue

Status: Open.

#13013 In leanprover/lean4;

· seanmcl opened on Mar 20, 2026

docstrings missmarked as comments

bugSomething isn't workingSomething isn't working

Status: Open.

#13007 In leanprover/lean4;

· joneugster opened on Mar 20, 2026

_root_.Lean.Environment.unsafeRunMetaM runs with fresh context, ignoring set options

bugSomething isn't workingSomething isn't working

Status: Open.

#12989 In leanprover/lean4;

· fiforeach opened on Mar 19, 2026

A match expression as example return type triggers lean.unknownIdentifier error

bugSomething isn't workingSomething isn't working

Status: Open.

#12985 In leanprover/lean4;

· RobertoZunino opened on Mar 19, 2026

exponential blow-up in isDefEq when unifying nested List.map calls

bugSomething isn't workingSomething isn't working

Status: Open.

#12983 In leanprover/lean4;

· datokrat opened on Mar 19, 2026

Lake, could not resolve host: github.com

bugSomething isn't workingSomething isn't working

Status: Open.

#12982 In leanprover/lean4;

· iacobucci opened on Mar 19, 2026

RFC: include RHS of implication in discrimination tree key for simp

RFCRequest for commentsRequest for comments

Status: Open.

#12978 In leanprover/lean4;

· TwoFX opened on Mar 19, 2026

Inconsistent naming for theorems about ++ [a] on lists

bugSomething isn't workingSomething isn't working

Status: Open.

#12968 In leanprover/lean4;

· TwoFX opened on Mar 18, 2026

field Notation prints unprovable goal as bla = bla

bugSomething isn't workingSomething isn't working

Status: Open.

#12967 In leanprover/lean4;

· MoritzBeroRoos opened on Mar 18, 2026

Unable to write to a file with an offset

bugSomething isn't workingSomething isn't working

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

Status: Open.

#12931 In leanprover/lean4;

· Nazgand opened on Mar 16, 2026