fix: make the exercise editable to run
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@ -101,7 +101,7 @@ and could then be used to compare a `&'a T` with any lifetime to an `i32`.
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Only a higher-ranked bound can be used here, because the lifetime of the reference is shorter than any possible lifetime parameter on the function。
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4、🌟🌟🌟
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```rust
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```rust,editable
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/* Adding HRTB to make it work!*/
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fn call_on_ref_zero<'a, F>(f: F) where F: Fn(&'a i32) {
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let zero = 0;
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@ -236,7 +236,7 @@ struct Ref<'a, T> {
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## A difficult exercise
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6、🌟🌟🌟🌟
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```rust
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```rust,editable
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/* Make it work */
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struct Interface<'a> {
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manager: &'a mut Manager<'a>
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@ -281,4 +281,4 @@ fn main() {
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fn use_list(list: &List) {
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println!("{}", list.manager.text);
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}
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```
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```
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