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https://github.com/rust-lang/rust
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29 lines
691 B
Rust
29 lines
691 B
Rust
// Check that one cannot subvert Drop Check rule via a user-defined
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// Clone implementation.
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#![allow(unused_variables, unused_assignments)]
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struct D<T:Copy>(T, &'static str);
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#[derive(Copy)]
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struct S<'a>(&'a D<i32>, &'static str);
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impl<'a> Clone for S<'a> {
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fn clone(&self) -> S<'a> {
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println!("cloning `S(_, {})` and thus accessing: {}", self.1, (self.0).0);
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S(self.0, self.1)
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}
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}
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impl<T:Copy> Drop for D<T> {
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fn drop(&mut self) {
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println!("calling Drop for {}", self.1);
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let _call = self.0.clone();
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}
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}
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fn main() {
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let (d2, d1);
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d1 = D(34, "d1");
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d2 = D(S(&d1, "inner"), "d2");
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}
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//~^^ ERROR `d1` does not live long enough
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