set_here() creates an empty file named
.here, by default
in the current directory.
When here encounters such a file, it uses the
directory that contains this file as root.
This is useful if none of the default criteria apply.
You need to restart the R session so that
picks up the newly created file.
set_here() should no longer be necessary
if all scripts and reports in a project call
which is now the recommended workflow for declaring the project root.
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