pub fn entry_problem(name: &str) -> Option<&'static str>Expand description
Why name cannot be an exclude_tag_providers entry, or None.
component_problem, plus a blank entry, an entry with leading or
trailing whitespace (a padded name would silently match no provider) and
an entry holding a control character anywhere (a newline or ESC would
forge or garble the stderr line that names the excluded providers).