sanitychecks.lean:1:8-1:15: error: fail to show termination for
  unsound
with errors
structural recursion cannot be used

well founded recursion has not been implemented yet
sanitychecks.lean:4:8-5:9: error: 'partial' theorems are not allowed, 'partial' is a code generation directive
sanitychecks.lean:7:7-8:9: error: 'unsafe' theorems are not allowed
sanitychecks.lean:10:0-10:24: error: failed to synthesize instance
  Inhabited False
sanitychecks.lean:18:0-18:40: error: failed to compile partial definition 'unsound3', failed to show that type is inhabited
sanitychecks.lean:20:12-20:20: error: (kernel) invalid declaration, it uses unsafe declaration 'unsafeCast'
sanitychecks.lean:23:12-23:20: error: (kernel) invalid declaration, it uses unsafe declaration 'unsafeCast'