Don't make unboxed closures implicitly copiable #19889
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The fix just checks if the bound is `Copy` and returns an `Err` if so. Closes: rust-lang#19817
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The fix just checks if the bound is `Copy` and returns an `Err` if so. Closes: rust-lang#19817 @nikomatsakis r?
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The fix just checks if the bound is
Copyand returns anErrif so.Closes: #19817
@nikomatsakis r?