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Rollup merge of #74266 - GuillaumeGomez:cleanup-e0720, r=Dylan-DPC

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Clean up E0720 explanation

r? @Dylan-DPC
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Yuki Okushi 2020-07-29 09:24:13 +09:00 • committed by GitHub
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8
src/librustc_error_codes/error_codes/E0720.md
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@ -1,11 +1,13 @@
An `impl Trait` type expands to a recursive type.
An `impl Trait` type must be expandable to a concrete type that contains no
`impl Trait` types. For example the following example tries to create an
`impl Trait` type `T` that is equal to `[T, T]`:
Erroneous code example:
```compile_fail,E0720
fn make_recursive_type() -> impl Sized {
[make_recursive_type(), make_recursive_type()]
}
```
An `impl Trait` type must be expandable to a concrete type that contains no
`impl Trait` types. For example the previous example tries to create an
`impl Trait` type `T` that is equal to `[T, T]`.