Done:

Crash on circular macro definitions in the editor.

src/TODO

@@ -6,8 +6,6 @@ necessary - it's slow, especially in UTF-8 locales.
 
 Don't allow stdout and stderr from extfs scripts pollute the screen.
 
-Crash on circular macro definitions in the editor.
-
 Add minimal UTF-8 support on Red Hat 8.0 to fix the frames or disable
 support for S-Lang library compiled with UTF-8 support.