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Termination checker error appears on the wrong invocation

bugSomething isn't workingSomething isn't working

Status: Open.

#13444 In leanprover/lean4;

· TwoFX opened on Apr 17, 2026

Recursive unsafe opaque declarations are not opaque

bugSomething isn't workingSomething isn't working

Status: Open.

#13439 In leanprover/lean4;

· Rob23oba opened on Apr 17, 2026

Lean.registerBuiltinAttribute with a .beforeElaboration attributes has no effect on structures

bugSomething isn't workingSomething isn't working

Status: Open.

#13433 In leanprover/lean4;

· grunweg opened on Apr 16, 2026

rw inserts rewritten hypothesis that forward-references fvar

bugSomething isn't workingSomething isn't working

Status: Open.

#13424 In leanprover/lean4;

· datokrat opened on Apr 15, 2026

Lake artifact cache: 'missing data file' for non-exported transitive imports via meta import chains

Status: Open.

#13419 In leanprover/lean4;

· nomeata opened on Apr 15, 2026

shake incorrectly removes imports providing typeclass instances used by inferInstanceAs

bugSomething isn't workingSomething isn't working

Status: Open.

#13417 In leanprover/lean4;

· bryangingechen opened on Apr 15, 2026

Sym.Simp.DiscrTree lookup fails when pattern contains lambda with loose bars

bugSomething isn't workingSomething isn't working

Status: Open.

#13416 In leanprover/lean4;

· wkrozowski opened on Apr 15, 2026

grind cannot match patterns if head expression is an e-class

bugSomething isn't workingSomething isn't working

Status: Open.

#13414 In leanprover/lean4;

· MrQubo opened on Apr 15, 2026

Hover shows resolved type but error shows unresolved metavariable

bugSomething isn't workingSomething isn't working

Status: Open.

#13411 In leanprover/lean4;

· math-fehr opened on Apr 15, 2026

Kernel error for inferInstanceAs with let declarations

bugSomething isn't workingSomething isn't working

Status: Open.

#13408 In leanprover/lean4;

· Rob23oba opened on Apr 14, 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