a No exception b Uncaught exception Backtrace_slots.Error("b") Raised at file "backtrace_slots.ml", line 47, characters 21-32 Called from file "backtrace_slots.ml", line 47, characters 42-53 Called from file "backtrace_slots.ml", line 47, characters 42-53 Called from file "backtrace_slots.ml", line 47, characters 42-53 Called from file "backtrace_slots.ml", line 47, characters 42-53 Called from file "backtrace_slots.ml", line 47, characters 42-53 Called from file "backtrace_slots.ml", line 51, characters 4-11 Re-raised at file "backtrace_slots.ml", line 53, characters 68-71 Called from file "backtrace_slots.ml", line 58, characters 11-23 Uncaught exception Backtrace_slots.Error("c") Raised at file "backtrace_slots.ml", line 54, characters 26-37 Called from file "backtrace_slots.ml", line 58, characters 11-23 Uncaught exception Backtrace_slots.Error("d") Raised at file "backtrace_slots.ml", line 47, characters 21-32 Called from file "backtrace_slots.ml", line 47, characters 42-53 Called from file "backtrace_slots.ml", line 47, characters 42-53 Called from file "backtrace_slots.ml", line 47, characters 42-53 Called from file "backtrace_slots.ml", line 47, characters 42-53 Called from file "backtrace_slots.ml", line 47, characters 42-53 Called from file "backtrace_slots.ml", line 51, characters 4-11 Called from file "backtrace_slots.ml", line 58, characters 11-23 Uncaught exception Invalid_argument("index out of bounds") Raised by primitive operation at file "backtrace_slots.ml", line 58, characters 14-22