Concoction contains a set of utility functions/types/macros that seemed useful at some point.
The FromInner derive macro is used to generate the boilerplate of a From<T> implementation where T is the inner type of your newtype struct.
Should your newtype struct need lifetimes, you can use the #[from_inner(lifetimes = 'a, 'b, 'c)] attribute to pass them along.
#[derive(FromInner)]
#[from_inner(lifetimes = 'a, 'b)]
struct MyNewtype<'a, 'b>(&'a Vec<&'b str>);The above would generate the following From implementation.
impl<'a, 'b> From<&'a Vec<&'b str>> for MyNewtype<'a, 'b> {
fn from(inner: &'a Vec<&'b str>) -> Self {
Self(inner)
}
}