The latest release of uLisp allows you to display a backtrace in each error message, showing the sequence of function calls that caused the error. This is helpful in tracking down errors in your uLisp programs. For more information see Backtrace.
The backtrace can also be displayed from within the break function; see Inserting breaks.
This release also features several other enhancements, including a major speed improvement to save-image, and support for PSRAM on the RP2350.