Unix.Unix_error(Unix.EACCES, "mkdir" ...

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* Environment
MacOS 10.15
VSCode 1.39.2
bs-platform 5.0.6
reason-language-server 1.7.1

* Reproduce
1. Install this plugin
2. Open ".re" file (File Path: "/Volumes/Server HD/devel/my-first-app/src/Demo.re")
3. VS Code display this alert.

> Unix.Unix_error(Unix.EACCES, "mkdir", "/Volumes/Server%20HD")
> Raised by primitive operation at file "util/Files.re", line 192, characters 4-27
> Called from file "util/Files.re", line 191, characters 4-18
> Called from file "util/Files.re", line 191, characters 4-18
> Called from file "util/Files.re", line 191, characters 4-18
> Called from file "util/Files.re", line 191, characters 4-18
> Called from file "util/Files.re", line 191, characters 4-18
> Called from file "src/lsp/Main.re", line 50, characters 2-52
> Called from file "src/lsp/BasicServer.re", line 130, characters 13-38

Start with util/Files.re around line 192, where the mkdir EACCES error is raised, and trace how it is reached from src/lsp/Main.re and src/lsp/BasicServer.re. Reproduce the report by opening the stated .re file on the given macOS setup. Done means the language server no longer attempts the failing mkdir for the encoded path and opening the file does not show this alert.

Written by the indexing model from the issue text.