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Update for anonymous-lifetime stabilization. #142

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Jan 30, 2019
Merged

Update for anonymous-lifetime stabilization. #142

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8 changes: 2 additions & 6 deletions src/rust-2018/ownership-and-lifetimes/the-anonymous-lifetime.md
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
# `'_`, the anonymous lifetime

![Minimum Rust version: nightly](https://img.shields.io/badge/Minimum%20Rust%20Version-nightly-red.svg)
![Minimum Rust version: 1.31](https://img.shields.io/badge/Minimum%20Rust%20Version-1.31-brightgreen.svg)

Rust 2018 allows you to explicitly mark where a lifetime is elided, for types
where this elision might otherwise be unclear. To do this, you can use the
Expand Down Expand Up @@ -36,8 +36,6 @@ impl<'a> fmt::Debug for StrWrap<'a> {
In Rust 2018, you can instead write:

```rust
#![feature(rust_2018_preview)]

# use std::fmt;
# struct StrWrap<'a>(&'a str);

Expand Down Expand Up @@ -84,8 +82,6 @@ impl<'a, 'b: 'a> Foo<'a, 'b> {
We can rewrite this as:

```rust
#![feature(rust_2018_preview)]

# struct Foo<'a, 'b: 'a> {
# field: &'a &'b str,
# }
Expand All @@ -100,4 +96,4 @@ impl Foo<'_, '_> {
This is the same, because for each `'_`, a fresh lifetime is generated.
Finally, the relationship `'a: 'b` which the struct requires must be upheld.

For more details, see the [tracking issue on In-band lifetime bindings](https://github.com/rust-lang/rust/issues/44524).
For more details, see the [tracking issue on In-band lifetime bindings](https://github.com/rust-lang/rust/issues/44524).