lean4-htt/doc/examples/Certora2022/ex5.lean
2022-11-21 17:02:28 -08:00

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/- Implicit arguments and universe polymorphism -/
def f (α β : Sort u) (a : α) (b : β) : α := a
#eval f Nat String 1 "hello"
-- 1
def g {α β : Sort u} (a : α) (b : β) : α := a
#eval g 1 "hello"
def h (a : α) (b : β) : α := a
#check g
-- ?m.1 → ?m.2 → ?m.1
#check @g
-- {α β : Sort u} → α → β → α
#check @h
-- {α : Sort u_1} → {β : Sort u_2} → α → β → α
#check g (α := Nat) (β := String)
-- Nat → String → Nat