leanprover

leanprover/lean4

Lean 4 programming language and theorem prover

4 good first / help-wanted issues · Lean · last activity Aug 6, 2026

8.7K stars 928 forks 8.7K watchers Lean Apache License 2.0

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4 Open Issues Need Help Last updated: Aug 6, 2026

Open Issues Need Help

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`deriving` does not handle `unsafe` (or `noncomputable`) 26 days ago

bug help wanted P-low

leanprover/lean4

8.7K

Lean 4 programming language and theorem prover

Lean

#lean#lean4

generalize not failing when match fails 3 months ago

bug help wanted P-low

leanprover/lean4

8.7K

Lean 4 programming language and theorem prover

Lean

#lean#lean4

Cleaning trace message option names about 1 year ago

help wanted P-low

leanprover/lean4

8.7K

Lean 4 programming language and theorem prover

Lean

#lean#lean4

Codegen emits function declaration twice with different linkages about 1 year ago

bug help wanted P-low

leanprover/lean4

8.7K

Lean 4 programming language and theorem prover

Lean

#lean#lean4