error not raised when type from another file is missing

[aisk]

cat b.thrift:

enum Status {
    OK = 1
    ERROR = 2
}

cat a.thrift:

include "b.thrift"

struct A {
    1: b.Status status
    2: b.InvalidType type  // notice that this type is not defined in b.
}

parse the files and dump the thrift_spec for struct A:

import thriftpy2


a = thriftpy2.load("a.thrift")
print(a.A.thrift_spec)

And got the result:

{1: (8, 'status', <class 'b.Status'>, False), 2: (<module 'b'>, 'type', False)}

As we can see, the field with number 2 have incomplete type, and there is no error been raised, and until someone called a function which returns a struct A, we got a missleading error message:

TypeError: an integer is required