Some errors are not correctly printed because input_name = "_none_" #5277
Original bug ID: 5277
In parsing/location.ml, the default value for input_name is "none", but a test in the same file assumes the default is "", and tries to open the file otherwise, which generates a failure in the case of "none" that prevents correct display of the message.
Steps to reproduce
ocamlc -pack -o x.cmo y.cmi
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