red.lean:3:11:failed to generate bytecode for 'f'
code generation failed, VM does not have code for 'g'
red.lean:9:19: error: type mismatch at definition 'example', has type
  f = f
but is expected to have type
  f = g
red.lean:12:0: error: type mismatch at application
  H ▸ rfl
term
  rfl
has type
  f (?M_1 a H a) = f (?M_1 a H a)
but is expected to have type
  f (?M_1 a H a) = a
red.lean:17:0: error: type mismatch at application
  H ▸ rfl
term
  rfl
has type
  f (?M_1 a H a) = f (?M_1 a H a)
but is expected to have type
  f (?M_1 a H a) = a