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Rollup merge of #75702 - GuillaumeGomez:cleanup-e0759, r=pickfire

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Clean up E0759 explanation

r? @Dylan-DPC

cc @pickfire
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Josh Stone 2020-08-20 10:07:22 -07:00 committed by GitHub
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18
src/librustc_error_codes/error_codes/E0759.md
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@ -1,34 +1,28 @@
A `'static` requirement in a return type involving a trait is not fulfilled.
Return type involving a trait did not require `'static` lifetime.
Erroneous code examples:
```compile_fail,E0759
use std::fmt::Debug;
fn foo(x: &i32) -> impl Debug {
fn foo(x: &i32) -> impl Debug { // error!
x
}
```
```compile_fail,E0759
# use std::fmt::Debug;
fn bar(x: &i32) -> Box<dyn Debug> {
fn bar(x: &i32) -> Box<dyn Debug> { // error!
Box::new(x)
}
```
These examples have the same semantics as the following:
Add `'static` requirement to fix them:
```compile_fail,E0759
# use std::fmt::Debug;
fn foo(x: &i32) -> impl Debug + 'static {
fn foo(x: &i32) -> impl Debug + 'static { // ok!
x
}
```
```compile_fail,E0759
# use std::fmt::Debug;
fn bar(x: &i32) -> Box<dyn Debug + 'static> {
fn bar(x: &i32) -> Box<dyn Debug + 'static> { // ok!
Box::new(x)
}
```