Name: HeaderLib
Functions:
  - Name: custom_realloc
    NullabilityOfRet: N
    Nullability: [ N, S ]
  - Name: unavailable_function
    Availability: none
    AvailabilityMsg: "I beg you not to use this"
  - Name: do_something_with_pointers
    NullabilityOfRet: O
    Nullability: [ N, O ]
    
Globals:
  - Name: global_int
    Nullability: N
  - Name: unavailable_global_int
    Availability: none