lean4-htt/tests/elab/2736.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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set_option autoImplicit true
section Mathlib.Algebra.Group.Defs
class MulOneClass (M : Type) extends One M, Mul M where
one_mul : ∀ a : M, 1 * a = a
export MulOneClass (one_mul)
end Mathlib.Algebra.Group.Defs
section Mathlib.Algebra.Ring.Defs
class Distrib (R : Type) extends Mul R, Add R where
right_distrib : ∀ a b c : R, (a + b) * c = a * c + b * c
class RightDistribClass (R : Type) [Mul R] [Add R] : Prop where
right_distrib : ∀ a b c : R, (a + b) * c = a * c + b * c
instance Distrib.rightDistribClass (R : Type) [Distrib R] : RightDistribClass R :=
⟨Distrib.right_distrib⟩
theorem add_mul [Mul R] [Add R] [RightDistribClass R] (a b c : R) :
(a + b) * c = a * c + b * c :=
RightDistribClass.right_distrib a b c
theorem add_one_mul [Add α] [MulOneClass α] [RightDistribClass α] (a b : α) :
(a + 1) * b = a * b + b := by
rw [add_mul, one_mul]
class Semiring (R : Type) extends Distrib R, MulOneClass R
end Mathlib.Algebra.Ring.Defs
section Mathlib.Data.Nat.Basic
instance : Semiring Nat where
add := Nat.add
mul := Nat.mul
one := Nat.succ Nat.zero
one_mul := sorry
right_distrib := sorry
end Mathlib.Data.Nat.Basic
#synth MulOneClass Nat -- works
#synth RightDistribClass Nat -- works
theorem ex1 [Add α] [MulOneClass α] [RightDistribClass α] (a b : α) :
(a + 1) * b = a * b + b := by
sorry
#check (ex1) -- should work
#check (add_one_mul) -- should work
#check @add_one_mul
example {a b : Nat} : (a + 1) * b = a * b + b := by
have := add_one_mul a b -- works
rw [add_one_mul] -- should work
example {a b : Nat} : (a + 1) * b = a * b + b := by
rw [add_one_mul] -- should work