25 lines
487 B
Text
25 lines
487 B
Text
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
|
|
namespace coercions
|
|
coercion of_nat
|
|
end coercions
|
|
end int
|
|
|
|
open nat
|
|
open int
|
|
constants n m : nat
|
|
check n+m -- coercion nat -> int is not available
|
|
open int.coercions
|
|
check n+m -- coercion nat -> int is available
|