공통 타이프들 조금 정의

doc/libraries.org

@@ -1,5 +1,7 @@
 #+title: on libraries
 
+* libraries and the file system
+
 R⁷RS leaves it unspecified how exactly libraries correspond to files:
 
 #+begin_quote
@@ -7,3 +9,11 @@ Programs and libraries are typically stored in files, although in some implement
 #+end_quote
 
 thus the implementation of ~define-library~ is open to much interpretation. we could possibly define libraries as first-class objects, or deal with them statically. the former case is appealing to me, as it could massively simplify interactive use.
+
+* semantics of declaration order
+
+mercifully, R⁷RS is similarly ambiguous when it comes to the significance of declaration order. the authors note explicitly example two equally acceptable approaches:
+
+#+begin_quote
+One possible implementation of libraries is as follows: _After all cond-expand library declarations are expanded, a new environment is constructed for the library consisting of all imported bindings._ The expressions from all begin, include and include-ci library declarations are expanded in that environment in the order in which they occur in the library. _Alternatively, cond-expand and import declarations may be processed in left to right order interspersed with the processing of other declarations_, with the environment growing as imported bindings are added to it by each import declaration.
+#+end_quote