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Kernel stack overflow with UInt64 arithmetic

bugSomething isn't workingSomething isn't working

Status: Open.

#11544 In leanprover/lean4;

· logical-misha opened on Dec 8, 2025

interaction between <code>simp?</code>, <code>norm_cast</code>, and <code>grind</code>

bugSomething isn't workingSomething isn't working

Status: Open.

#11543 In leanprover/lean4;

· kim-em opened on Dec 8, 2025

"Cannot derive functional induction principle" for function involving mutual inductives

bugSomething isn't workingSomething isn't working

Status: Open.

#11540 In leanprover/lean4;

· sgraf812 opened on Dec 7, 2025

grind regression: fails on goals that previously worked

Status: Open.

#11539 In leanprover/lean4;

· kim-em opened on Dec 7, 2025

String.toNat? should support underscores as digit separators for consistency with numeric literals

bugSomething isn't workingSomething isn't working

Status: Open.

#11538 In leanprover/lean4;

· NicolasRouquette opened on Dec 7, 2025

Incorrect Types in TOML Schema for <code>lakefile.toml</code>

bugSomething isn't workingSomething isn't working

Status: Open.

#11535 In leanprover/lean4;

· maxwell3025 opened on Dec 6, 2025

Bad error message when <code>mintro</code> fails to parse

bugSomething isn't workingSomething isn't working

Status: Open.

#11509 In leanprover/lean4;

· david-christiansen opened on Dec 4, 2025

Partial function crashes when hidden behind a type class

bugSomething isn't workingSomething isn't working

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

Status: Open.

#11486 In leanprover/lean4;

· hgoldstein95 opened on Dec 3, 2025

Bug in deprecation linter

bugSomething isn't workingSomething isn't working

Status: Open.

#11478 In leanprover/lean4;

· abdoo8080 opened on Dec 2, 2025

<code>simp</code> uses <code>congr</code> lemmas that are not visible

bugSomething isn't workingSomething isn't working

Status: Open.

#11436 In leanprover/lean4;

· datokrat opened on Dec 1, 2025

VS Code F2 renaming goes too far

bugSomething isn't workingSomething isn't working

Status: Open.

#11403 In leanprover/lean4;

· ocfnash opened on Nov 27, 2025

failed to generate equality theorem when mixing patterns on index and indexed type

bugSomething isn't workingSomething isn't working

P-lowWe are not planning to work on this issueWe are not planning to work on this issue

Status: Open.

#11342 In leanprover/lean4;

· nomeata opened on Nov 24, 2025