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| author | Michael Goulet <michael@errs.io> | 2024-03-20 16:53:50 -0400 |
|---|---|---|
| committer | Michael Goulet <michael@errs.io> | 2024-03-21 11:42:49 -0400 |
| commit | 2d633317f30dd02895f167b65dc1feeee0d08265 (patch) | |
| tree | 50b3622db66615853ae53baa9c54d968f01e413b /library/core/src/macros/mod.rs | |
| parent | 2627e9f3012a97d3136b3e11bf6bd0853c38a534 (diff) | |
| download | rust-2d633317f30dd02895f167b65dc1feeee0d08265.tar.gz rust-2d633317f30dd02895f167b65dc1feeee0d08265.zip | |
Implement macro-based deref!() syntax for deref patterns
Stop using `box PAT` syntax for deref patterns, as it's misleading and also causes their semantics being tangled up.
Diffstat (limited to 'library/core/src/macros/mod.rs')
| -rw-r--r-- | library/core/src/macros/mod.rs | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/library/core/src/macros/mod.rs b/library/core/src/macros/mod.rs index ebcaa626bd3..a78842c8f8d 100644 --- a/library/core/src/macros/mod.rs +++ b/library/core/src/macros/mod.rs @@ -1714,6 +1714,18 @@ pub(crate) mod builtin { builtin # type_ascribe($expr, $ty) } + #[cfg(not(bootstrap))] + /// Unstable placeholder for deref patterns. + #[allow_internal_unstable(builtin_syntax)] + #[unstable( + feature = "deref_patterns", + issue = "87121", + reason = "placeholder syntax for deref patterns" + )] + pub macro deref($pat:pat) { + builtin # deref($pat) + } + /// Unstable implementation detail of the `rustc` compiler, do not use. #[rustc_builtin_macro] #[stable(feature = "rust1", since = "1.0.0")] |