NoExpand indicates literal string replacement.
It can be used with
replace_all to do a literal string
replacement without expanding
$name to their corresponding capture
groups. This can be both convenient (to avoid escaping
$, for example)
and performant (since capture groups don't need to be found).
't is the lifetime of the literal text.
impl<'t> RefUnwindSafe for NoExpand<'t>
impl<'t> UnwindSafe for NoExpand<'t>
type Error = Infallible
The type returned in the event of a conversion error.