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Auto merge of #107599 - clubby789:debug-less-ref, r=nnethercote
authorbors <bors@rust-lang.org>
Fri, 3 Feb 2023 14:22:42 +0000 (14:22 +0000)
committerbors <bors@rust-lang.org>
Fri, 3 Feb 2023 14:22:42 +0000 (14:22 +0000)
Don't generate unecessary `&&self.field` in deriving Debug

Since unsized fields may only be the last one in a struct, we only need to generate a double reference (`&&self.field`) for the  final one.

cc `@nnethercote`


Trivial merge
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