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More than one explicit lifetime bound was used on a trait object.
Example of erroneous code:
```compile_fail,E0226
trait Foo {}
type T<'a, 'b> = dyn Foo + 'a + 'b; // error: Trait object `arg` has two
// lifetime bound, 'a and 'b.
```
Here `T` is a trait object with two explicit lifetime bounds, 'a and 'b.
Only a single explicit lifetime bound is permitted on trait objects.
To fix this error, consider removing one of the lifetime bounds:
```
trait Foo {}
type T<'a> = dyn Foo + 'a;
```
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