+#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
+pub enum FieldKind {
+ AdtField,
+ Upvar,
+ GeneratorLocal,
+}
+
+impl std::fmt::Display for FieldKind {
+ fn fmt(&self, w: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ match self {
+ FieldKind::AdtField => write!(w, "field"),
+ FieldKind::Upvar => write!(w, "upvar"),
+ FieldKind::GeneratorLocal => write!(w, "local"),
+ }
+ }
+}
+