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An evaluation of a trait requirement overflowed.
Erroneous code example:
```compile_fail,E0275
trait Foo {}
struct Bar<T>(T);
impl<T> Foo for T where Bar<T>: Foo {}
```
This error occurs when there was a recursive trait requirement that overflowed
before it could be evaluated. This often means that there is an unbounded
recursion in resolving some type bounds.
To determine if a `T` is `Foo`, we need to check if `Bar<T>` is `Foo`. However,
to do this check, we need to determine that `Bar<Bar<T>>` is `Foo`. To
determine this, we check if `Bar<Bar<Bar<T>>>` is `Foo`, and so on. This is
clearly a recursive requirement that can't be resolved directly.
Consider changing your trait bounds so that they're less self-referential.
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