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When looking for the field names and types of a given type, account for tuples. This allows suggestions for incorrectly nested field accesses and field name typos to trigger as intended. Previously these suggestions only worked on `ty::Adt`, including tuple structs which are no different to tuples, so they should behave the same in suggestions.
```
error[E0599]: no method named `get_ref` found for tuple `(BufReader<File>,)` in the current scope
--> $DIR/missing-field-access.rs:11:15
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LL | let x = f.get_ref();
| ^^^^^^^ method not found in `(BufReader<File>,)`
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help: one of the expressions' fields has a method of the same name
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LL | let x = f.0.get_ref();
| ++
```
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This slightly changes error messages in `float-field.rs`, but nothing of
real importance.
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- Put every literal in its own braces, rather than just some of them,
for maximal error recovery.
- Add a blank line between every case, for readability.
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Take into account implicit dereferences when suggesting fields.
```
error[E0609]: no field `longname` on type `Arc<S>`
--> $DIR/suggest-field-through-deref.rs:10:15
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LL | let _ = x.longname;
| ^^^^^^^^ help: a field with a similar name exists: `long_name`
```
CC https://github.com/rust-lang/rust/issues/78374#issuecomment-719564114
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