Generalized. Pipe in the file from the shell, user definable search term and entry point.
unit sub MAIN ( :$for, :$at = 0 );
put slurp.split( /\n\n+/ ).grep( { .contains: $for } )
.map( { .substr: .index: $at } )
.join: "\n----------------\n"
raku search.raku --for='SystemError' --at='Traceback' < traceback.txt
Matches expected except for not having a extraneous trailing paragraph separator.