The parameter list macro invention introduced in 165 has been put to use: a parameter list macro called :key is provided which endows a function with keyword parameters.
New feature: deferred warnings: unbound variable and function warnings are now deferred so that if a later definition is seen, the warning is suppressed.
Unbound warnings enabled across TXR pattern language now.
Improvements in awk macro and other improvements: some new exception related macros, new convenience functions for diagnosing errors in macro expanders, and more.