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error[E0277]: the trait bound `Bar: Hash` is not satisfied
--> $DIR/issue-21160.rs:8:12
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LL | #[derive(Hash)]
| ---- in this derive macro expansion
LL | struct Foo(Bar);
| ^^^ the trait `Hash` is not implemented for `Bar`
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::: $SRC_DIR/core/src/hash/mod.rs:LL:COL
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LL | fn hash<H: Hasher>(&self, state: &mut H);
| - required by this bound in `std::hash::Hash::hash`
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= note: this error originates in the derive macro `Hash` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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