error[E0425]: cannot find value `x` in this scope
  --> $DIR/tuple-suggestions-issue-142488.rs:7:14
   |
LL |     for a in x {
   |              ^ not found in this scope

error[E0599]: the method `to_string` exists for tuple `(_,)`, but its trait bounds were not satisfied
  --> $DIR/tuple-suggestions-issue-142488.rs:9:14
   |
LL |         (a,).to_string()
   |              ^^^^^^^^^ method cannot be called on `(_,)` due to unsatisfied trait bounds
   |
   = note: the following trait bounds were not satisfied:
           `(_,): std::fmt::Display`
           which is required by `(_,): ToString`

error[E0599]: the method `meth` exists for tuple `((), HashMap<_, _>)`, but its trait bounds were not satisfied
  --> $DIR/tuple-suggestions-issue-142488.rs:24:44
   |
LL |     ((), std::collections::HashMap::new()).meth()
   |                                            ^^^^ method cannot be called on `((), HashMap<_, _>)` due to unsatisfied trait bounds
   |
note: trait bound `HashMap<_, _>: Trait` was not satisfied
  --> $DIR/tuple-suggestions-issue-142488.rs:19:12
   |
LL | impl<T, U: Trait> Trait for (T, U) {
   |            ^^^^^  -----     ------
   |            |
   |            unsatisfied trait bound introduced here
   = help: items from traits can only be used if the trait is implemented and in scope
note: `Trait` defines an item `meth`, perhaps you need to implement it
  --> $DIR/tuple-suggestions-issue-142488.rs:15:1
   |
LL | trait Trait {
   | ^^^^^^^^^^^

error[E0599]: the method `f` exists for tuple `(_,)`, but its trait bounds were not satisfied
  --> $DIR/tuple-suggestions-issue-142488.rs:46:16
   |
LL |     Struct.f().f();
   |                ^ method cannot be called on `(_,)` due to unsatisfied trait bounds
   |
note: the following trait bounds were not satisfied:
      `&(_,): I`
      `&mut (_,): I`
      `(_,): I`
  --> $DIR/tuple-suggestions-issue-142488.rs:43:27
   |
LL | impl<T> Tr for T where T: I {}
   |         --     -          ^ unsatisfied trait bound introduced here
   = help: items from traits can only be used if the trait is implemented and in scope
note: `Tr` defines an item `f`, perhaps you need to implement it
  --> $DIR/tuple-suggestions-issue-142488.rs:34:1
   |
LL | trait Tr {
   | ^^^^^^^^

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0425, E0599.
For more information about an error, try `rustc --explain E0425`.