ref-cast 1.0.25

Safely cast &T to &U where the struct U contains a single field of type T.
Documentation 
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use ref_cast::{ref_cast_custom, RefCastCustom};

#[derive(RefCastCustom)]
#[repr(transparent)]
pub struct Thing(String);

impl Thing {
    #[ref_cast_custom]
    pub fn ref_cast(s: &String) -> &Self {}
}

fn main() {}