Committing for reference

SWAP.md

@@ -1,12 +1,17 @@
-### Swapfile
-A loose collection of ideas to quickly resume work
-
----
-
 Must figure out how preprocessor can both be a System and referenced in the interpreter
 
 Must actually write macro system as recorded in note
 
 At this point swappable preprocessors aren't a target because interaction with module system sounds complicated
 
-Check if any of this needs interpreter, if so, start with that
+Check if any of this needs interpreter, if so, start with that
+
+
+## alternate extension mechanism
+
+The Macro extension needs to be in the same compilation unit as the interpreter because the interpreter needs to proactively access its datastructures (in particular, it needs to generate MacTree from TokTree)
+
+Ideally, it should reuse `orchid-extension` for message routing and decoding.
+
+`orchid-host` accepts extensions as `impl ExtensionPort`
+