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-rw-r--r--compiler/stable_mir/src/abi.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/stable_mir/src/abi.rs b/compiler/stable_mir/src/abi.rs
index 2ac30b5aff1..cf28a0c5885 100644
--- a/compiler/stable_mir/src/abi.rs
+++ b/compiler/stable_mir/src/abi.rs
@@ -181,6 +181,7 @@ impl FieldsShape {
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize)]
 pub enum VariantsShape {
     /// Single enum variants, structs/tuples, unions, and all non-ADTs.
+    // FIXME: needs to become `Option` like in the internal type.
     Single { index: VariantIdx },
 
     /// Enum-likes with more than one inhabited variant: each variant comes with