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Add a macro that derives TryFrom<u32> for fieldless enums

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This commit is contained in:
Zalathar 2024-10-25 18:22:03 +11:00
parent 80d0d927d5
commit 144a12acdd
6 changed files with 187 additions and 0 deletions
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10
compiler/rustc_macros/src/lib.rs
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@ -20,6 +20,7 @@ mod lift;
mod query;
mod serialize;
mod symbols;
mod try_from;
mod type_foldable;
mod type_visitable;
@ -165,3 +166,12 @@ decl_derive!(
suggestion_part,
applicability)] => diagnostics::subdiagnostic_derive
);
decl_derive! {
[TryFromU32] =>
/// Derives `TryFrom<u32>` for the annotated `enum`, which must have no fields.
/// Each variant maps to the value it would produce under an `as u32` cast.
///
/// The error type is `u32`.
try_from::try_from_u32
}