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Something other than a type or const parameter has been used when one was
expected.
Erroneous code example:
```compile_fail,E0799
fn bad1() -> impl Sized + use<main> {}
fn bad2(x: ()) -> impl Sized + use<x> {}
fn main() {}
```
In the given examples, for `bad1`, the name `main` corresponds to a function
rather than a type or const parameter. In `bad2`, the name `x` corresponds to
a function argument rather than a type or const parameter.
Only type and const parameters, including `Self`, may be captured by
`use<...>` precise capturing bounds.
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