lean2/tests/lean/run/e13.lean
Leonardo de Moura 4f2e0c6d7f refactor(frontends/lean): add 'attribute' command
The new command provides a uniform way to set declaration attributes.
It replaces the commands: class, instance, coercion, multiple_instances,
reducible, irreducible
2015-01-24 20:23:21 -08:00

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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
namespace coercions
attribute of_nat [coercion]
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