main thread:
Raised by primitive operation at file "callstack.ml", line 12, characters 38-66
Called from file "callstack.ml", line 13, characters 27-32
Called from file "callstack.ml", line 14, characters 27-32
Called from file "callstack.ml", line 15, characters 27-32
Called from file "callstack.ml", line 17, characters 9-14
new thread:
Raised by primitive operation at file "callstack.ml", line 12, characters 38-66
Called from file "callstack.ml", line 13, characters 27-32
Called from file "callstack.ml", line 14, characters 27-32
Called from file "callstack.ml", line 15, characters 27-32
Called from file "thread.ml", line 39, characters 8-14
Raised by primitive operation at file "callstack.ml", line 12, characters 38-66
Called from file "callstack.ml", line 23, characters 2-18