cfunction
src/core/debug.c on line 220 , column 1
(debug/break source line col )
Sets a breakpoint in `source` at a given line and column. Will
throw an error if the breakpoint location cannot be found. For
example
(debug/break "core.janet" 10 4 )
will set a breakpoint at line 10 , 4th column of the file
core.janet.