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* simplify `ToTokens` impl for `Representation` Instead of collecting the representation and modifier into `Option`s and determining whether a comma is needed manually, we can use the `Puncutuated` struct which handles commas automatically. This will also make emitting the `align` modifier in the future easier. * emit alignment modifier This is required for correctly implementing `CheckedBitPattern` because we need the layout of the type and its `Bits` type to have the same layout. * add unit test for `#[repr]` parsing * allow multiple alignment modifiers According to RFC #1358, if multiple alignment modifiers are specified, the resulting alignment is the maximum of all alignment modifiers. * actually return the error we just created * factor out the integer Repr's into their own type This is a preparation step for adding support for `#[repr(C, int)]`. * allow parsing `#[repr(C, int)]` This can be used on enums with fields. * derive `CheckedBitPattern` for enums with fields The implementation mostly mirrors the desugaring described at https://doc.rust-lang.org/reference/type-layout.html * add comments and rename some idents * update error message * update docs for `CheckedBitPattern` derive * add new nested test case, change generated type naming scheme * fix wrong comment * small nit --------- Co-authored-by: Gray Olson <gray@grayolson.com> |
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