Auto merge of #69088 - JohnTitor:rollup-x7bk7h7, r=JohnTitor

Rollup of 11 pull requests

Successful merges:

 - #67695 (Added dyn and true keyword docs)
 - #68487 ([experiment] Support linking from a .rlink file)
 - #68554 (Split lang_items to crates `rustc_hir` and `rustc_passes`.)
 - #68937 (Test failure of unchecked arithmetic intrinsics in const eval)
 - #68947 (Python script PEP8 style guide space formatting and minor Python source cleanup)
 - #68999 (remove dependency on itertools)
 - #69026 (Remove common usage pattern from `AllocRef`)
 - #69027 (Add missing `_zeroed` varants to `AllocRef`)
 - #69058 (Preparation for allocator aware `Box`)
 - #69070 (Add self to .mailmap)
 - #69077 (Fix outdated doc comment.)

Failed merges:

r? @ghost

1 files changed, 38 insertions, 0 deletions

diff --git a/src/librustc_data_structures/macros.rs b/src/librustc_data_structures/macros.rs
index 83e6dbedee2..67fbe3058cd 100644
--- a/src/librustc_data_structures/macros.rs
+++ b/src/librustc_data_structures/macros.rs
@@ -17,3 +17,41 @@ macro_rules! static_assert_size {
         const _: [(); $size] = [(); ::std::mem::size_of::<$ty>()];
     };
 }
+
+#[macro_export]
+macro_rules! enum_from_u32 {
+    ($(#[$attr:meta])* pub enum $name:ident {
+        $($variant:ident = $e:expr,)*
+    }) => {
+        $(#[$attr])*
+        pub enum $name {
+            $($variant = $e),*
+        }
+
+        impl $name {
+            pub fn from_u32(u: u32) -> Option<$name> {
+                $(if u == $name::$variant as u32 {
+                    return Some($name::$variant)
+                })*
+                None
+            }
+        }
+    };
+    ($(#[$attr:meta])* pub enum $name:ident {
+        $($variant:ident,)*
+    }) => {
+        $(#[$attr])*
+        pub enum $name {
+            $($variant,)*
+        }
+
+        impl $name {
+            pub fn from_u32(u: u32) -> Option<$name> {
+                $(if u == $name::$variant as u32 {
+                    return Some($name::$variant)
+                })*
+                None
+            }
+        }
+    }
+}