Checking for null objects in type-of.
Fixing octal case of parse-c-integer.
Speeding up grammar macros with a cond-expanded ER macro.
Fixing macro walking for multi-arg variants of */+/?.
Adding -> as an alias for =>, maybe deprecate the latter.
Handling (chibi ast) the same for make clean/install/uninstall as other chibi libs.
Fixes issue #175.
Fixed typo for building ast w/o threads - #if not #ifdef.
Cond-expand out threading code to load leap-second table dynamically when threads are disabled.
Thread parameters are still needed when threads are disabled.
Fixing exception handlers for threadless builds.
SRFI-18 can now build without error for threadless builds, as an empty library.
Actually importing it in this case reports an error.