pub fn is_exact_date(date: &str) -> Option<bool>Expand description
Checks that the running or installed rustc was released exactly on
some date.
The format of date must be YYYY-MM-DD. For instance: 2016-12-20 or
2017-01-09.
If the date cannot be retrieved or parsed, or if date could not be parsed,
returns None. Otherwise returns true if the installed rustc was
release on date and false otherwise.