fix coerce unsized impl restriction #1935
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fixes #1574
Unsure whether we want to document them even though
CoerceUnsizedis unstable. Sourcehttps://github.com/rust-lang/rust/blob/f8f6997469237299c1d60814c7b9828602a1f8e4/compiler/rustc_hir_analysis/src/coherence/builtin.rs#L430-L547