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Rollup merge of #110694 - est31:builtin, r=petrochenkov

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Implement builtin # syntax and use it for offset_of!(...)

Add `builtin #` syntax to the parser, as well as a generic infrastructure to support both item and expression position builtin syntaxes. The PR also uses this infrastructure for the implementation of the `offset_of!` macro, added by #106934.

cc `@petrochenkov` `@DrMeepster`

cc #110680 `builtin #` tracking issue
cc #106655 `offset_of!` tracking issue
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Dylan DPC 2023-05-09 12:33:45 +05:30 • committed by GitHub
commit dbd090c655
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25 changed files with 333 additions and 136 deletions
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6
library/core/src/mem/mod.rs
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@ -1315,9 +1315,9 @@ impl<T> SizedTypeProperties for T {}
///
/// assert_eq!(mem::offset_of!(NestedA, b.0), 0);
/// ```
#[unstable(feature = "offset_of", issue = "106655")]
#[rustc_builtin_macro]
#[cfg(not(bootstrap))]
#[unstable(feature = "offset_of", issue = "106655")]
#[allow_internal_unstable(builtin_syntax)]
pub macro offset_of($Container:ty, $($fields:tt).+ $(,)?) {
/* compiler built-in */
builtin # offset_of($Container, $($fields).+)
}