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//@ edition:2018
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#![feature(allocator_api)]
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struct Struct;
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impl Struct {
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async fn box_ref_Struct(self: Box<Self, impl FnMut(&mut Self)>) -> &u32 {
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//~^ ERROR Box<Struct, impl FnMut(&mut Self)>` cannot be used as the type of `self` without
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&1
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}
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}
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fn main() {}
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