lean2/tests/lean/run/e9.lean

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Text

prelude
precedence `+`:65
namespace nat
constant nat : Type.{1}
constant add : nat → nat → nat
infixl + := add
end nat
namespace int
open nat (nat)
constant int : Type.{1}
constant add : int → int → int
infixl + := add
constant of_nat : nat → int
end int
namespace int_coercions
coercion [persistent] int.of_nat
end int_coercions
-- Open "only" the notation and declarations from the namespaces nat and int
open nat
open int
constants n m : nat
constants i j : int
check n + m
check i + j
section
-- Temporarily use the int_coercions
open int_coercions
check n + i
end
-- The following one is an error
-- check n + i