lean2/tests/lean/run/fun.lean

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import function logic num bool
using function num bool
variable f : num → bool
variable g : num → num
check f ∘ g ∘ g
check typeof id : num → num
check num → num ⟨is_typeof⟩ id
variable h : num → bool → num
check flip h
check flip h '0 zero
check typeof flip h '0 zero : num
variable f1 : num → num → bool
variable f2 : bool → num
check (f1 on f2) '0 '1