mirror of
https://github.com/leanprover/lean4.git
synced 2026-03-17 18:34:06 +00:00
08eb78a5b2
This PR sets up the new integrated test/bench suite. It then migrates all benchmarks and some related tests to the new suite. There's also some documentation and some linting. For now, a lot of the old tests are left alone so this PR doesn't become even larger than it already is. Eventually, all tests should be migrated to the new suite though so there isn't a confusing mix of two systems.
39 lines
1.3 KiB
Lean4
39 lines
1.3 KiB
Lean4
set_option cbv.warning false
|
|
|
|
def popcount : Nat → Nat
|
|
| 0 => 0
|
|
| 1 => 1
|
|
| n@(_+2) => if n % 2 = 0 then popcount (n / 2) else popcount (n / 2) + 1
|
|
termination_by n => n
|
|
|
|
/--
|
|
error: Tactic `decide` failed for proposition
|
|
popcount 123498203491224398 = 32
|
|
because its `Decidable` instance
|
|
instDecidableEqNat (popcount 123498203491224398) 32
|
|
did not reduce to `isTrue` or `isFalse`.
|
|
|
|
After unfolding the instances `instDecidableEqNat` and `Nat.decEq`, reduction got stuck at the `Decidable` instance
|
|
match h : (popcount 123498203491224398).beq 32 with
|
|
| true => isTrue ⋯
|
|
| false => isFalse ⋯
|
|
-/
|
|
#guard_msgs in
|
|
example : popcount 123498203491224398 = 32 := by decide
|
|
|
|
example : popcount 123498203491224398 = 32 := by conv => lhs; cbv
|
|
|
|
example : popcount 1234982034912243981 = 30 := by conv => lhs; cbv
|
|
|
|
example : popcount 1234982034912243981523 = 35 := by conv => lhs; cbv
|
|
|
|
example : popcount 12349820349122439815231238 = 42 := by conv => lhs; cbv
|
|
|
|
example : popcount 12349820349122439815231238098123 = 49 := by conv => lhs; cbv
|
|
|
|
example : popcount 1234982034912243981523123809812323 = 65 := by conv => lhs; cbv
|
|
|
|
example : popcount 1234982034912243981523123809812323982928213984812309234 = 101 := by conv => lhs; cbv
|
|
|
|
example : popcount 1234982034912243981523123809812323982928213984812309234213989 = 84 := by conv => lhs; cbv
|