lean4-htt/tests/elab/issue3204.lean
Garmelon 08eb78a5b2
chore: switch to new test/bench suite (#12590)
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.
2026-02-25 13:51:53 +00:00

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def zero_out (arr : Array Nat) (i : Nat) : Array Nat :=
if h : i < arr.size then
zero_out (arr.set i 0) (i + 1)
else
arr
termination_by arr.size - i
decreasing_by simp; apply Nat.sub_succ_lt_self _ _ h
-- set_option trace.Elab.definition true
theorem size_zero_out (arr : Array Nat) (i : Nat) : (zero_out arr i).size = arr.size := by
unfold zero_out
split
· rw [size_zero_out]
rw [Array.size_set]
· rfl
termination_by arr.size - i
decreasing_by simp; apply Nat.sub_succ_lt_self; assumption