Error code E0203

Having multiple relaxed default bounds is unsupported.

Erroneous code example:

struct Bad<T: ?Sized + ?Send>{
    inner: T
}
Run

Here the type T cannot have a relaxed bound for multiple default traits (Sized and Send). This can be fixed by only using one relaxed bound.

struct Good<T: ?Sized>{
    inner: T
}
Run

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