lean2/tests/lean/run/e9.lean
2014-08-07 16:59:08 -07:00

38 lines
643 B
Text

precedence `+`:65
namespace nat
variable nat : Type.{1}
variable add : nat → nat → nat
infixl + := add
end nat
namespace int
using nat (nat)
variable int : Type.{1}
variable add : int → int → int
infixl + := add
variable of_nat : nat → int
end int
namespace int_coercions
coercion int.of_nat
end int_coercions
-- Using "only" the notation and declarations from the namespaces nat and int
using nat
using int
variables n m : nat
variables i j : int
check n + m
check i + j
section
-- Temporarily use the int_coercions
using int_coercions
check n + i
end
-- The following one is an error
-- check n + i