mirror of
https://github.com/rust-lang/rust
synced 2024-09-15 22:50:55 +00:00
31 lines
637 B
Rust
31 lines
637 B
Rust
use std::ops::Deref;
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trait MyTrait: Deref<Target = u32> {}
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struct MyStruct(u32);
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impl MyTrait for MyStruct {}
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impl Deref for MyStruct {
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type Target = u32;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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fn get_concrete_value(i: u32) -> MyStruct {
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MyStruct(i)
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}
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fn get_boxed_value(i: u32) -> Box<dyn MyTrait> {
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Box::new(get_concrete_value(i))
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}
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fn main() {
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let v = [1, 2, 3]
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.iter()
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.map(|i| get_boxed_value(*i))
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.collect::<Vec<_>>();
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let el = &v[0];
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for _ in v {
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//~^ ERROR cannot move out of `v` because it is borrowed
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println!("{}", ***el > 0);
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}
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}
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