protected.lean:10:7: error: unknown identifier 'x'
Foo.x : Nat
Foo.y : Nat
protected.lean:22:7: error: unknown identifier 'y'
z : Nat
protected.lean:25:14: error: protected declarations must be in a namespace
protected.lean:28:14: error: unknown identifier 'f'
8
protected.lean:38:14: error: unknown identifier 'g'
protected.lean:47:6: error: unknown identifier 'g'
protected.lean:47:0: error: failed to synthesize
  Lean.Eval ?m
8