lean2/tests/lean/run/coe8.lean

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import logic
namespace experiment
constant nat : Type.{1}
constant int : Type.{1}
constant of_nat : nat → int
coercion of_nat
constant nat_add : nat → nat → nat
constant int_add : int → int → int
infixl `+` := int_add
infixl `+` := nat_add
print "================"
constant tst (n m : nat) : @eq int (of_nat n + of_nat m) (n + m)
check tst
exit