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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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2
compiler/rustc_feature/src/active.rs
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@ -313,6 +313,8 @@ declare_features! (
(active, async_closure, "1.37.0", Some(62290), None),
/// Allows async functions to be declared, implemented, and used in traits.
(active, async_fn_in_trait, "1.66.0", Some(91611), None),
/// Allows builtin # foo() syntax
(active, builtin_syntax, "CURRENT_RUSTC_VERSION", Some(110680), None),
/// Allows `c"foo"` literals.
(active, c_str_literals, "CURRENT_RUSTC_VERSION", Some(105723), None),
/// Treat `extern "C"` function as nounwind.