New_merlin: report compiler error as errors rather than exceptions
New_merlin: report compiler error as errors rather than exceptions

rgrinberg/merlin,dra27/merlin,dra27/merlin,the-lambda-church/merlin,rgrinberg/merlin,rgrinberg/merlin,dra27/merlin,rgrinberg/merlin,ocaml/merlin,the-lambda-church/merlin,the-lambda-church/merlin,dra27/merlin,ocaml/merlin,ocaml/merlin,ocaml/merlin