make no-variant types a dedicated Variants variant

2024-12-01 17:33:01 +01:00
parent 21de42bf8d
commit e023590de4
53 changed files with 246 additions and 495 deletions
--- a/compiler/rustc_mir_transform/src/large_enums.rs
+++ b/compiler/rustc_mir_transform/src/large_enums.rs
@@ -216,7 +216,7 @@ impl EnumSizeOpt {
        };
        let layout = tcx.layout_of(typing_env.as_query_input(ty)).ok()?;
        let variants = match &layout.variants {
-            Variants::Single { .. } => return None,
+            Variants::Single { .. } | Variants::Empty => return None,
            Variants::Multiple { tag_encoding: TagEncoding::Niche { .. }, .. } => return None,

            Variants::Multiple { variants, .. } if variants.len() <= 1 => return None,