Invalid arg from Marshal.from_bytes

[jonahbeckford]

Moved the "Second Attempt" problem from ocaml-ppx/ppxlib#466 to this issue

Context:

 (preprocess
  (action
   (run %{lib:TheNameOfTheLibrary:ppx.exe} -as-pp %{input-file})))

Problem:

[Error - 4:50:25 PM] Request textDocument/codeAction failed.
  Message: uncaught exception
  Code: -32603 
[object Object]
detached: /-----------------------------------------------------------------------
| Internal error: Uncaught exception.
| Invalid_argument("Marshal.from_bytes")
| Raised at Stdlib.invalid_arg in file "stdlib.ml", line 30, characters 20-45
| Called from Stdlib__Marshal.from_string in file "marshal.ml" (inlined), line 67, characters 2-46
| Called from Merlin_kernel__Pparse.decode_potential_ast in file "src/ocaml/driver/pparse.ml", line 200, characters 14-47
| Called from Merlin_kernel__Mpipeline.process in file "src/kernel/mpipeline.ml", line 253, characters 10-120
| Called from CamlinternalLazy.force_lazy_block in file "camlinternalLazy.ml", line 31, characters 17-27
| Re-raised at CamlinternalLazy.force_lazy_block in file "camlinternalLazy.ml", line 36, characters 4-11
| Called from Merlin_kernel__Mpipeline.timed_lazy in file "src/kernel/mpipeline.ml", line 17, characters 10-22
| Re-raised at Merlin_kernel__Mpipeline.timed_lazy in file "src/kernel/mpipeline.ml", line 19, characters 34-49
| Called from CamlinternalLazy.force_lazy_block in file "camlinternalLazy.ml", line 31, characters 17-27
| Re-raised at CamlinternalLazy.force_lazy_block in file "camlinternalLazy.ml", line 36, characters 4-11
| Called from Merlin_kernel__Mpipeline.input_source in file "src/kernel/mpipeline.ml", line 111, characters 25-46
| Called from Merlin_kernel__Mpipeline.with_pipeline.(fun) in file "src/kernel/mpipeline.ml", line 115, characters 39-55
| Called from Stdlib__Fun.protect in file "fun.ml", line 33, characters 8-15
| Re-raised at Stdlib__Fun.protect in file "fun.ml", line 38, characters 6-52
| Called from Merlin_kernel__Mocaml.with_state in file "src/kernel/mocaml.ml", line 18, characters 8-38
| Re-raised at Merlin_kernel__Mocaml.with_state in file "src/kernel/mocaml.ml", line 20, characters 42-53
| Called from Ocaml_lsp_server__Document.Single_pipeline.use.(fun) in file "ocaml-lsp-server/src/document.ml", line 147, characters 22-77
| Called from Stdune__Exn_with_backtrace.try_with in file "otherlibs/stdune/src/exn_with_backtrace.ml", line 9, characters 8-12
| Re-raised at Stdune__Exn.raise_with_backtrace in file "otherlibs/stdune/src/exn.ml" (inlined), line 38, characters 27-56
| Called from Stdune__Exn_with_backtrace.reraise in file "otherlibs/stdune/src/exn_with_backtrace.ml", line 20, characters 33-71
| Called from Fiber__Core.O.(>>|).(fun) in file "fiber/src/core.ml", line 250, characters 36-41
| Called from Fiber__Scheduler.exec in file "fiber/src/scheduler.ml", line 73, characters 8-11
\-----------------------------------------------------------------------