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Rollup merge of #68200 - KodrAus:stabilize/debug_map_key_value, r=alexcrichton

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Stabilize the debug_map_key_value feature

RFC: https://github.com/rust-lang/rfcs/pull/2696
Tracking issue: #62482

Stabilizes the `debug_map_key_value` feature, which covers:

```rust
impl<'a, 'b> DebugMap<'a, 'b> {
    pub fn key(&mut self, key: &dyn fmt::Debug) -> &mut DebugMap<'a, 'b> {}
    pub fn value(&mut self, value: &dyn fmt::Debug) -> &mut DebugMap<'a, 'b> {}
}
```

These methods are small and self-contained, and are used as the basis for the existing `DebugMap::entry` method, so have been used in the wild for the last 6 months or so.
This commit is contained in:
Yuki Okushi 2020-01-28 10:48:04 +09:00 committed by GitHub
commit 5c42ffe150
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3 changed files with 2 additions and 14 deletions
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9
src/doc/unstable-book/src/library-features/debug-map-key-value.md
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@ -1,9 +0,0 @@
# `debug_map_key_value`
The tracking issue for this feature is: [#62482]
[#62482]: https://github.com/rust-lang/rust/issues/62482
------------------------
Add the methods `key` and `value` to `DebugMap` so that an entry can be formatted across multiple calls without additional buffering.

6
src/libcore/fmt/builders.rs
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@ -778,7 +778,6 @@ impl<'a, 'b: 'a> DebugMap<'a, 'b> {
/// # Examples
///
/// ```
/// # #![feature(debug_map_key_value)]
/// use std::fmt;
///
/// struct Foo(Vec<(String, i32)>);
@ -796,7 +795,7 @@ impl<'a, 'b: 'a> DebugMap<'a, 'b> {
/// "{\"whole\": [(\"A\", 10), (\"B\", 11)]}",
/// );
/// ```
#[unstable(feature = "debug_map_key_value", reason = "recently added", issue = "62482")]
#[stable(feature = "debug_map_key_value", since = "1.42.0")]
pub fn key(&mut self, key: &dyn fmt::Debug) -> &mut Self {
self.result = self.result.and_then(|_| {
assert!(
@ -843,7 +842,6 @@ impl<'a, 'b: 'a> DebugMap<'a, 'b> {
/// # Examples
///
/// ```
/// # #![feature(debug_map_key_value)]
/// use std::fmt;
///
/// struct Foo(Vec<(String, i32)>);
@ -861,7 +859,7 @@ impl<'a, 'b: 'a> DebugMap<'a, 'b> {
/// "{\"whole\": [(\"A\", 10), (\"B\", 11)]}",
/// );
/// ```
#[unstable(feature = "debug_map_key_value", reason = "recently added", issue = "62482")]
#[stable(feature = "debug_map_key_value", since = "1.42.0")]
pub fn value(&mut self, value: &dyn fmt::Debug) -> &mut Self {
self.result = self.result.and_then(|_| {
assert!(self.has_key, "attempted to format a map value before its key");

1
src/libcore/tests/lib.rs
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@ -4,7 +4,6 @@
#![feature(cell_update)]
#![feature(core_private_bignum)]
#![feature(core_private_diy_float)]
#![feature(debug_map_key_value)]
#![feature(debug_non_exhaustive)]
#![feature(dec2flt)]
#![feature(exact_size_is_empty)]