Do not treat paths as encoded in ISO-8859-1 #6695
Original bug ID: 6695
Currently, ocamlc uses
Today, no supported operating system where OCaml runs always encodes paths as ISO-8859-1. Rather, UTF-8 is used on sane platforms, and a locale-specific encoding on Windows. Thus, this case-folding is practically always broken and the derived name will contain garbage if the first letter is not included in US-ASCII.
This is a separate issue from #6694. Not only the impact in this case is very clear and the scope is limited to the compiler, but the current behavior is also more clearly broken.
Comment author: @alainfrisch
Note that currently, source code is interpreted as a Latin1 stream, and Latin1 letters are allowed in module identifiers (although is deprecated and raises Warning 3). It's probably a good time to turn this into a proper error, otherwise we need to specify how these names are mapped to filenames, and I don't think we want to go into that.