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Added TODO

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Justin Ethier 2017-01-03 19:01:24 -05:00
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docs/Writing-the-Cyclone-Scheme-Compiler-Revision-1.md
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@ -109,6 +109,8 @@ Most of the transformations follow a similar pattern of recursively examining an
((app? exp) (reduce union (map search exp) '()))
(else (error "unknown expression: " exp))))
TODO: mention nanopass, which seems to be a better approach but is R6RS so not really an option for this project :(
### Macro Expansion
Macro expansion is one of the first transformations. Any macros the compiler knows about are loaded as functions into a macro environment, and a single pass is made over the code. When the compiler finds a macro the code is expanded by calling the macro. The compiler then inspects the resulting code again in case the macro expanded into another macro.