support deriving Hash for nullary structs
#21162
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r? @huonw (rust_highfive has picked a reviewer for you, use r? to override) |
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I don't think the test failure is related to this PR. |
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This fixes #16530 by hashing nullary structs [the same way as the empty tuple] (https://github.com/rust-lang/rust/blob/master/src/libcore/hash/mod.rs#L185). Other approaches are possible, but this was the simplest.
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This fixes #16530 by hashing nullary structs the same way as the empty tuple. Other approaches are possible, but this was the simplest.