diff options
Diffstat (limited to 'compiler/rustc_abi/src/lib.rs')
| -rw-r--r-- | compiler/rustc_abi/src/lib.rs | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/compiler/rustc_abi/src/lib.rs b/compiler/rustc_abi/src/lib.rs index 15a27c0b6ee..ca15f7d9920 100644 --- a/compiler/rustc_abi/src/lib.rs +++ b/compiler/rustc_abi/src/lib.rs @@ -1504,10 +1504,12 @@ impl BackendRepr { #[derive(PartialEq, Eq, Hash, Clone, Debug)] #[cfg_attr(feature = "nightly", derive(HashStable_Generic))] pub enum Variants<FieldIdx: Idx, VariantIdx: Idx> { + /// A type with no valid variants. Must be uninhabited. + Empty, + /// Single enum variants, structs/tuples, unions, and all non-ADTs. Single { - /// Always 0 for non-enums/generators. - /// For enums without a variant, this is an invalid index! + /// Always `0` for types that cannot have multiple variants. index: VariantIdx, }, |