Raised at Stdlib.failwith in file "stdlib.ml", line 29, characters 17-33
Called from Backtrace.foo in file "backtrace.ml", line 12, characters 11-27
Called from Backtrace.bar in file "backtrace.ml", line 20, characters 4-9
Called from Backtrace.task1 in file "backtrace.ml", line 29, characters 4-10
Re-raised at Stdlib__Effect.Deep.discontinue_with_backtrace.(fun) in file "effect.ml", line 66, characters 41-75
Called from Backtrace.task2 in file "backtrace.ml", line 36, characters 4-16