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error[E0261]: use of undeclared lifetime name `'a`
--> $DIR/box-pattern-type-mismatch.rs:7:31
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LL | struct X(dyn Iterator<Item = &'a ()>);
| ^^ undeclared lifetime
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= note: for more information on higher-ranked polymorphism, visit https://doc.rust-lang.org/nomicon/hrtb.html
help: consider making the bound lifetime-generic with a new `'a` lifetime
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LL | struct X(dyn for<'a> Iterator<Item = &'a ()>);
| +++++++
help: consider introducing lifetime `'a` here
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LL | struct X<'a>(dyn Iterator<Item = &'a ()>);
| ++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0261`.
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