Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
fb30932ca7
This only really shows up when the `decreasing_tactic` fails with multiple goals, as in ``` macro_rules | `(tactic|decreasing_tactic) => `(tactic| by_cases (2 > 1)) def foo (n : Nat) : Nat := foo (n - 1) termination_by foo n => n ``` where we now get ``` unsolved goals case inl n: Nat h✝: 2 > 1 ⊢ (invImage (fun a => a) instWellFoundedRelation).1 (n - 1) n case inr n: Nat h✝: ¬2 > 1 ⊢ (invImage (fun a => a) instWellFoundedRelation).1 (n - 1) n ``` rather than ``` LeanProject.lean:3:27 unsolved goals case inl n: Nat h✝: 2 > 1 ⊢ (invImage (fun a => a) instWellFoundedRelation).1 (n - 1) n LeanProject.lean:3:27 unsolved goals case inr n: Nat h✝: ¬2 > 1 ⊢ (invImage (fun a => a) instWellFoundedRelation).1 (n - 1) n ``` The effect is neglectible, but the code is a bit nicer, so why not, before someone looks at it again and wonders whether the goals are reported separately for a reason. |
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This is the repository for Lean 4.
We provide nightly releases and have just begun regular stable point releases.
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