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// rust-lang/rust#57979 : the initial support for `impl Trait` didn't
// properly check syntax hidden behind an associated type projection.
// Here we test behavior of occurrences of `impl Trait` within an
// `impl Trait` in that context.
pub trait Foo<T> { }
pub trait Bar { }
pub trait Quux { type Assoc; }
pub fn demo(_: impl Quux<Assoc=impl Foo<impl Bar>>) { }
//~^ ERROR nested `impl Trait` is not allowed
fn main() { }
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