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This example creates a configuration file using a fallback rule.
See README.org for details
By default, config is set:
$ dune exec ./src/plop.exe
Built with support for blah: true
Path to blah is: "/path/to/blah"
Print generated config:
$ cat _build/default/config.full
let with_blah = true
let blah_path = "/path/to/blah"
Now, we disable it, and re-run:
$ echo "let enable_blah = No" > config
$ dune exec ./src/plop.exe
Built with support for blah: false
Path to blah is: "<no support for blah>"
$ cat _build/default/config.full
let with_blah = false
let blah_path = "<no support for blah>"
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