chickadee » trace » break

(break [PROCEDURE ...])procedure

Modifies the given procedures to signal a condition on entry. The condition is of the kinds exn and breakpoint and will terminate execution unless caught. In the interpreter, the condition is accessible on the toplevel using the ,exn command. Use (continue) to continue execution. If no arguments are given, (break) lists all procedures that currently have breakpoints set.

Note that PROCEDURE may be any procedure and doesn't necessarily have to be a toplevel definition.