@mul.{1} nat nat.has_mul a b : nat
@add.{1} nat nat.has_add a b : nat
concrete_instance.lean:8:9: warning: failed to generate bytecode for 'nat.semigroup'
code generation failed, VM does not have code for 'sorry'
concrete_instance.lean:9:9: warning: failed to generate bytecode for 'nat.add_semigroup'
code generation failed, VM does not have code for 'sorry'
@mul.{1} nat nat.has_mul a b : nat
@add.{1} nat nat.has_add a b : nat