/usr/local/home/nroberts/.opam/ocaml-base-compiler/bin/dune diagnostics
Error: exception Invalid_argument("Bytes.create")
Raised by primitive operation at Stdlib__Bytes.make in file "[bytes.ml](http://bytes.ml/)", line
  42, characters 10-18
Called from Stdlib__String.make in file "[string.ml](http://string.ml/)" (inlined), line 41,
  characters 2-12
Called from Stdune__loc.pp_file_excerpt.pp_file_excerpt in file
  "otherlibs/stdune/src/[loc.ml](http://loc.ml/)", line 72, characters 52-73
Called from Stdune__result.bind in file "otherlibs/stdune/src/[result.ml](http://result.ml/)"
  (inlined), line 33, characters 12-15
Called from Stdune__result.O.(>>=) in file "otherlibs/stdune/src/[result.ml](http://result.ml/)"
  (inlined), line 68, characters 20-29
Called from Stdune__loc.pp_file_excerpt in file
  "otherlibs/stdune/src/[loc.ml](http://loc.ml/)", line 117, characters 6-158
Called from Stdune__loc.pp in file "otherlibs/stdune/src/[loc.ml](http://loc.ml/)", line 140,
  characters 5-72
Called from Main__diagnostics.format_diagnostic in file "bin/[diagnostics.ml](http://diagnostics.ml/)",
  line 25, characters 67-77
Called from Main__diagnostics.exec.(fun) in file "bin/[diagnostics.ml](http://diagnostics.ml/)", line
  50, characters 55-78
Called from Stdlib__List.iter in file "[list.ml](http://list.ml/)", line 110, characters 12-15
Called from Fiber__core.O.(>>|).(fun) in file "otherlibs/fiber/src/[core.ml](http://core.ml/)",
  line 250, characters 36-41
Called from Fiber__scheduler.exec in file "otherlibs/fiber/src/[scheduler.ml](http://scheduler.ml/)",
  line 73, characters 8-11

I must not crash.  Uncertainty is the mind-killer. Exceptions are the
little-death that brings total obliteration.  I will fully express my cases.
Execution will pass over me and through me.  And when it has gone past, I
will unwind the stack along its path.  Where the cases are handled there will
be nothing.  Only I will remain.