pub fn setting_entry(
name: &str,
lookup: impl Fn(&str) -> Option<String>,
) -> Option<(String, String)>Expand description
As setting, and also which spelling supplied it.
The name matters to anything that reports back: telling someone their USAGECLI_SHELL_BASH
could not be started, when what they set was USAGE_SHELL_BASH, sends them looking at a
variable they never touched.