lean4-htt/tests/elab/def20.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 f : Char → Nat
| 'a' => 0
| 'b' => 1
| 'c' => 2
| 'd' => 3
| 'e' => 4
| _ => 5
theorem ex1 : (f 'a', f 'b', f 'c', f 'd', f 'e', f 'f') = (0, 1, 2, 3, 4, 5) := rfl
def g : Nat → Nat
| 100000 => 0
| 200000 => 1
| 300000 => 2
| 400000 => 3
| _ => 5
-- This uses `(rfl)` and no `rfl` to avoid the `rfl` attribute kicking in
-- and trying to prove the theorem with full transparency and without smart unfolding,
-- which goes wrong
theorem ex2 : (g 100000, g 200000, g 300000, g 400000, g 0) = (0, 1, 2, 3, 5) := (rfl)
def h : String → Nat
| "hello" => 0
| "world" => 1
| "bla" => 2
| "boo" => 3
| _ => 5
theorem ex3 : (h "hello", h "world", h "bla", h "boo", h "zoo") = (0, 1, 2, 3, 5) :=
rfl
def r : String × String → Nat
| ("hello", "world") => 0
| ("world", "hello") => 1
| _ => 2
theorem ex4 : (r ("hello", "world"), r ("world", "hello"), r ("a", "b")) = (0, 1, 2) :=
rfl
example (a b : String) (h : a.length > 10) : r (a, b) = 2 := by
simp [r]
split
next h => injection h with h; subst h; contradiction
next h => injection h with h; subst h; contradiction
next => decide