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Emit padding-asserting code that doesn't trigger clippy::identity_op (#45)

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Yanchi Toth 2020-10-21 22:11:30 +02:00 committed by GitHub
parent 92ce415317
commit b264926ac0
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1 changed files with 10 additions and 3 deletions
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13
derive/src/traits.rs
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@ -213,9 +213,16 @@ fn generate_assert_no_padding(
let span = input.ident.span();
let fields = get_struct_fields(input)?;
let field_types = get_field_types(&fields);
let size_sum =
quote_spanned!(span => 0 #( + ::core::mem::size_of::<#field_types>() )*);
let mut field_types = get_field_types(&fields);
let size_sum = if let Some(first) = field_types.next() {
let size_first = quote_spanned!(span => ::core::mem::size_of::<#first>());
let size_rest =
quote_spanned!(span => #( + ::core::mem::size_of::<#field_types>() )*);
quote_spanned!(span => #size_first#size_rest)
} else {
quote_spanned!(span => 0)
};
Ok(quote_spanned! {span => const _: fn() = || {
struct TypeWithoutPadding([u8; #size_sum]);