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struct Foo<T = impl Copy>(T);
//~^ ERROR `impl Trait` is not allowed in generic parameter defaults
type Result<T, E = impl std::error::Error> = std::result::Result<T, E>;
//~^ ERROR `impl Trait` is not allowed in generic parameter defaults
// should not cause ICE
fn x() -> Foo {
Foo(0)
}
fn main() -> Result<()> {}
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