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<code>sizeOf</code> generation failure on higher-order nested types

bugSomething isn't workingSomething isn't working

Status: Open.

#11828 In leanprover/lean4;

· arthur-adjedj opened on Dec 29, 2025

Compiler crashes on modules that import both a precompiled library and <code>Lake.CLI</code>

bugSomething isn't workingSomething isn't working

Status: Open.

#11827 In leanprover/lean4;

· zqy1018 opened on Dec 29, 2025

"The recommended spelling of ¬ in identifiers is not" is wrong

bugSomething isn't workingSomething isn't working

Status: Open.

#11826 In leanprover/lean4;

· safinaskar opened on Dec 29, 2025

<code>declare_syntax_cat</code> in private section causes "unknown constant" on import

bugSomething isn't workingSomething isn't working

Status: Open.

#11823 In leanprover/lean4;

· datokrat opened on Dec 29, 2025

RFC: improving performance of <code>deriving Hashable</code> on single-field structures

RFCRequest for commentsRequest for comments

Status: Open.

#11818 In leanprover/lean4;

· math-fehr opened on Dec 28, 2025

Metavariable introduced in pattern match

bugSomething isn't workingSomething isn't working

Status: Open.

#11817 In leanprover/lean4;

· math-fehr opened on Dec 28, 2025

Race condition in lean4 stage2+ builds

bugSomething isn't workingSomething isn't working

Status: Open.

#11808 In leanprover/lean4;

· NicolasRouquette opened on Dec 27, 2025

Add getElem?_mergeWith lemma for TreeMap/DTreeMap

Status: Open.

#11807 In leanprover/lean4;

· alok opened on Dec 27, 2025

Lake and graph interop failure via <code>lake-manifest.json</code>

bugSomething isn't workingSomething isn't working

Status: Open.

#11805 In leanprover/lean4;

· davideger opened on Dec 26, 2025

panic in async elaboration for theorems with a docstring within <code>where</code>

bugSomething isn't workingSomething isn't working

Status: Open.

#11799 In leanprover/lean4;

· chenson2018 opened on Dec 25, 2025

unfortunate interaction of <code>isDefEq</code>, <code>simp</code> and proof irrelevance

bugSomething isn't workingSomething isn't working

Status: Open.

#11798 In leanprover/lean4;

· hargoniX opened on Dec 25, 2025

isDefEq: constant approximation should permute binder telescope

enhancementNew feature or requestNew feature or request

Status: Open.

#11796 In leanprover/lean4;

· sgraf812 opened on Dec 25, 2025