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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
|
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
|
LL | let x = f.0.get_ref();
| ++
```
|
