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Report errors on malformed serde attributes, like
#[serde(rename =)]
-- the compiler used to reject these itself, but when the compiler relaxed its requirements on attribute syntax these malformed attributes began silently being ignored by serde_derive -
Eliminate unused variable warning when using skip_serializing inside a tuple variant of an adjacently tagged enum (#1617, thanks @arilotter)
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Support skip attribute inside of newtype variants (#1622, thanks @Xaeroxe)