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+error[E0277]: the trait bound `Bar: Hash` is not satisfied
+ --> $DIR/issue-21160.rs:8:12
+ |
+LL | #[derive(Hash)]
+ | ---- in this derive macro expansion
+LL | struct Foo(Bar);
+ | ^^^ the trait `Hash` is not implemented for `Bar`
+ |
+ = note: this error originates in the derive macro `Hash` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider annotating `Bar` with `#[derive(Hash)]`
+ |
+LL | #[derive(Hash)]
+ |
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.