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bors 4edff843dd Auto merge of #61347 - Centril:stabilize-underscore_const_names, r=petrochenkov 
Stabilize underscore_const_names in 1.37.0

You are now permitted to write:

```rust
const _: $type_expression = $term_expression;
```

That is, we change the [grammar of items](9d1984d7ae/grammar/item.lyg (L3-L42)), as written in [the *`.lyg`* notation](263bf161da (grammar)), from:

```java
Item = attrs:OuterAttr* vis:Vis? kind:ItemKind;
ItemKind =
  | ...
  | Const:{ "const" name:IDENT ":" ty:Type "=" value:Expr ";" }
  | ...
  ;
```

into:

```java
Item = attrs:OuterAttr* vis:Vis? kind:ItemKind;
ItemKind =
  | ...
  | Const:{ "const" name:IdentOrUnderscore ":" ty:Type "=" value:Expr ";" }
  | ...
  ;

IdentOrUnderscore =
  | Named:IDENT
  | NoName:"_"
  ;
```

r? @petrochenkov
2019-06-16 20:33:55 +00:00
..
graph Kill dead code dominator code. 2019-04-09 11:48:31 +01:00
obligation_forest rustc: doc comments 2019-02-10 23:42:32 +00:00
owning_ref Separate librustc_data_structures module 2019-06-16 14:17:01 +03:00
snapshot_map librustc_data_structures => 2018 2019-02-09 01:36:22 +09:00
sorted_map Separate librustc_data_structures module 2019-06-16 14:17:01 +03:00
base_n.rs rustc: doc comments 2019-02-10 23:42:32 +00:00
bit_set.rs Add more functionality to BitMatrix 2019-06-10 14:46:40 -07:00
box_region.rs Make the rustc driver and interface demand driven 2019-03-10 04:49:45 +01:00
Cargo.toml rustc: use indexmap instead of a plain vector for upvars. 2019-06-01 19:17:22 +03:00
const_cstr.rs Remove licenses 2018-12-25 21:08:33 -07:00
fingerprint.rs librustc_data_structures => 2018 2019-02-09 01:36:22 +09:00
flock.rs Remove bitrig support from rust 2019-05-13 11:09:06 +02:00
fx.rs rustc: use indexmap instead of a plain vector for upvars. 2019-06-01 19:17:22 +03:00
indexed_vec.rs Add Step::sub_usize 2019-05-25 02:53:08 +02:00
interner.rs Remove licenses 2018-12-25 21:08:33 -07:00
jobserver.rs Clean up jobserver integration 2019-04-09 07:44:10 +02:00
lib.rs Make the rustc driver and interface demand driven 2019-03-10 04:49:45 +01:00
macros.rs Stabilize underscore_const_names: stage0 -> bootstrap. 2019-06-10 06:17:39 +02:00
ptr_key.rs librustc_data_structures => 2018 2019-02-09 01:36:22 +09:00
sip128.rs rustc: doc comments 2019-02-10 23:42:32 +00:00
small_c_str.rs Remove licenses 2018-12-25 21:08:33 -07:00
sorted_map.rs Separate librustc_data_structures module 2019-06-16 14:17:01 +03:00
stable_hasher.rs Add more functionality to BitMatrix 2019-06-10 14:46:40 -07:00
svh.rs rustc: doc comments 2019-02-10 23:42:32 +00:00
sync.rs Add some comments 2019-03-06 04:47:08 +01:00
thin_vec.rs Allow attributes in formal function parameters 2019-06-09 07:58:40 -03:00
tiny_list.rs librustc_data_structures => 2018 2019-02-09 01:36:22 +09:00
transitive_relation.rs rustc: doc comments 2019-02-10 23:42:32 +00:00
vec_linked_list.rs librustc_data_structures => 2018 2019-02-09 01:36:22 +09:00
work_queue.rs rustc: doc comments 2019-02-10 23:42:32 +00:00