Function blessing 

pub(super) fn blessing(
    bless: Option<&OsStr>,
    ci: Option<&OsStr>,
) -> Result<bool, Error>

Whether this run rewrites the goldens, from the values of BLESS and CI (N95).

Errors

Error::unclassifiable when BLESS is set to anything but 1, or is 1 under CI: a leaked or mistyped variable must not turn the golden gate into a pass that compares nothing.