Unbound module and module type in dune build

Learning
,
2

OCaml source files are automatically modules, so you don’t need to declare nested modules with the module and module type keywords. Also, I strongly recommend that you match each directory’s name with the name of its main module. This will greatly reduce the number of different concepts you have to worry about:

bin/
  bin.ml
  dune
greeter/
  dune
  greeter.ml
  greeter.mli

And the dune files:

; bin/dune
(executable
  (name bin)
  (libraries greeter))

; greeter/dune
(library
  (name greeter))
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