lean2/tests/lean/run/rw_set1.lean

import data.nat

namespace foo
  attribute nat.add_assoc [simp]
  print nat.add_assoc
end foo

print nat.add_assoc

namespace foo
  print nat.add_assoc
  attribute nat.add_comm [simp]
  open nat
  print "---------"
  print [simp]
end foo