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Clean up E0720 explanation #74266

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Jul 29, 2020
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Clean up E0720 explanation #74266

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8 changes: 5 additions & 3 deletions src/librustc_error_codes/error_codes/E0720.md
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Original file line number Diff line number Diff line change
@@ -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]`.