25 lines
618 B
Rust
25 lines
618 B
Rust
// Example cycle where a bound on `T` uses a shorthand for `T`. This
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// creates a cycle because we have to know the bounds on `T` to figure
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// out what trait defines `Item`, but we can't know the bounds on `T`
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// without knowing how to handle `T::Item`.
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//
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// Note that in the future cases like this could perhaps become legal,
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// if we got more fine-grained about our cycle detection or changed
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// how we handle `T::Item` resolution.
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use std::ops::Add;
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// Preamble.
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trait Trait { type Item; }
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struct A<T>
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where T : Trait,
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T : Add<T::Item>
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//~^ ERROR cycle detected
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{
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data: T
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}
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fn main() {
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}
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