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error[E0261]: use of undeclared lifetime name `'db`
--> $DIR/nested-impl-trait-in-tait.rs:3:40
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LL | pub type Tait = impl Iterator<Item = (&'db Key, impl Iterator)>;
| ^^^ 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 `'db` lifetime
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LL | pub type Tait = impl for<'db> Iterator<Item = (&'db Key, impl Iterator)>;
| ++++++++
help: consider introducing lifetime `'db` here
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LL | pub type Tait<'db> = impl Iterator<Item = (&'db Key, impl Iterator)>;
| +++++
error[E0412]: cannot find type `Key` in this scope
--> $DIR/nested-impl-trait-in-tait.rs:3:44
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LL | pub type Tait = impl Iterator<Item = (&'db Key, impl Iterator)>;
| ^^^ not found in this scope
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help: consider importing this struct
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LL + use std::thread::local_impl::Key;
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error: unconstrained opaque type
--> $DIR/nested-impl-trait-in-tait.rs:3:17
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LL | pub type Tait = impl Iterator<Item = (&'db Key, impl Iterator)>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: `Tait` must be used in combination with a concrete type within the same module
error: unconstrained opaque type
--> $DIR/nested-impl-trait-in-tait.rs:3:49
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LL | pub type Tait = impl Iterator<Item = (&'db Key, impl Iterator)>;
| ^^^^^^^^^^^^^
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= note: `Tait` must be used in combination with a concrete type within the same module
error: aborting due to 4 previous errors
Some errors have detailed explanations: E0261, E0412.
For more information about an error, try `rustc --explain E0261`.
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