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Account for bare tuples and `Pin` methods in field searching logic 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. When suggesting field access which would encounter a method not found, do not suggest pinning when those methods are on `impl Pin` itself. ``` 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>,)` | help: one of the expressions' fields has a method of the same name | LL | let x = f.0.get_ref(); | ++ ``` instead of ``` 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>,)` | help: consider pinning the expression | LL ~ let mut pinned = std::pin::pin!(f); LL ~ let x = pinned.as_ref().get_ref(); | ``` Fix rust-lang/rust#144602.