bos
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Bos.Cmd.of_string: open the negative result ((_, [> R.msg ]) result)
same as Pat.of_string etc. This makes programming and composition easier (avoids calls to Rresult.R.open_error_msg).
It also makes compiler error messages less clear. I haven't used bos in a while. What's the general strategy ?
Since we can always open the error message (e.g. with Rresult.open_err_msg`), there's no need for this PR.