inaccessible2.lean:5:7: error: invalid occurrence of 'inaccessible' annotation, it must only occur in patterns
inaccessible2.lean:5:4: error: invalid use of inaccessible term, the provided term is
  f sorry
but is expected to be
  f a
inaccessible2.lean:4:11: warning: declaration 'inv_1' uses sorry
inaccessible2.lean:8:10: error: invalid pattern, must be an application, constant, variable, type ascription or inaccessible term
inaccessible2.lean:11:11: error: invalid pattern, must be an application, constant, variable, type ascription or inaccessible term
inaccessible2.lean:14:9: error: invalid pattern, in a constructor application, the parameters of the inductive datatype must be marked as inaccessible
inaccessible2.lean:14:20: error: ill-formed match/equations expression
inaccessible2.lean:13:11: warning: declaration 'symm' uses sorry
