Rollup merge of #145827 - estebank:issue-51976, r=jackh726

On unused binding or binding not present in all patterns, suggest potential typo of unit struct/variant or const

When encountering an or-pattern with a binding not available in all patterns, look for consts and unit struct/variants that have similar names as the binding to detect typos.

```
error[E0408]: variable `Ban` is not bound in all patterns
  --> $DIR/binding-typo.rs:22:9
   |
LL |         (Foo, _) | (Ban, Foo) => {}
   |         ^^^^^^^^    --- variable not in all patterns
   |         |
   |         pattern doesn't bind `Ban`
   |
help: you might have meant to use the similarly named unit variant `Bar`
   |
LL -         (Foo, _) | (Ban, Foo) => {}
LL +         (Foo, _) | (Bar, Foo) => {}
   |
```

For items that are not in the immedate scope, suggest the full path for them:

```
error[E0408]: variable `Non` is not bound in all patterns
  --> $DIR/binding-typo-2.rs:51:16
   |
LL |         (Non | Some(_))=> {}
   |          ---   ^^^^^^^ pattern doesn't bind `Non`
   |          |
   |          variable not in all patterns
   |
help: you might have meant to use the similarly named unit variant `None`
   |
LL -         (Non | Some(_))=> {}
LL +         (core::option::Option::None | Some(_))=> {}
   |
```

When encountering a typo in a pattern that gets interpreted as an unused binding, look for unit struct/variant of the same type as the binding:

```
error: unused variable: `Non`
  --> $DIR/binding-typo-2.rs:36:9
   |
LL |         Non => {}
   |         ^^^
   |
help: if this is intentional, prefix it with an underscore
   |
LL |         _Non => {}
   |         +
help: you might have meant to pattern match on the similarly named variant `None`
   |
LL -         Non => {}
LL +         std::prelude::v1::None => {}
   |
```

 Suggest constant on unused binding in a pattern

```
error: unused variable: `Batery`
  --> $DIR/binding-typo-2.rs:110:9
   |
LL |         Batery => {}
   |         ^^^^^^
   |
help: if this is intentional, prefix it with an underscore
   |
LL |         _Batery => {}
   |         +
help: you might have meant to pattern match on the similarly named constant `Battery`
   |
LL |         Battery => {}
   |            +
```

Fix rust-lang/rust#51976.

0 files changed, 0 insertions, 0 deletions