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How to implement `define-library`?

define-library can be nested
expressions inside define-library are compiled and evaluated in order sequentially
import declarations inside define-library and on the top level are semantically the same
each define-library creates one syntactic-env
and the body is evaluated as if it's on the top level
so each toplevel definitions' results are registered to the global table
but their renamed symbols are known only to who imported the library.

export table

import syntax destructively registers renamed symbols taken from export table of the specified library to syntactic env of the library
export syntax registers correspoindings of original and renamed symbols to export table of the current library
therefore, we need some kind of forward declaration support, because export syntax is usually placed at the beginning of source code.