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1 type BuiltIn = for<'a> fn(&str);
2 
3 struct Function {
4     inner: BuiltIn,
5 }
6 
7 impl Function {
new(subr: BuiltIn) -> Self8     fn new(subr: BuiltIn) -> Self {
9         Self { inner: subr }
10     }
11 }
12 
dummy(_: &str)13 fn dummy(_: &str) {}
14 
main()15 fn main() {
16     let func1 = Function::new(dummy);
17     let func2 = Function::new(dummy);
18     let inner: fn(&'static _) -> _ = func1.inner;
19     assert!(inner == func2.inner);
20 }
21