diff --git a/ast/asdl_rs.py b/ast/asdl_rs.py
index a962a10..afe8d96 100755
--- a/ast/asdl_rs.py
+++ b/ast/asdl_rs.py
@@ -288,7 +288,7 @@ class StructVisitor(EmitVisitor):
     def simple_sum(self, sum, name, depth):
         rust_name = rust_type_name(name)
         self.emit_attrs(depth)
-        self.emit("#[derive(is_macro::Is)]", depth)
+        self.emit("#[derive(is_macro::Is, Copy)]", depth)
         self.emit(f"pub enum {rust_name} {{", depth)
         for variant in sum.types:
             self.emit(f"{variant.name},", depth + 1)
diff --git a/ast/src/gen/generic.rs b/ast/src/gen/generic.rs
index 39ccdc7..391fd89 100644
--- a/ast/src/gen/generic.rs
+++ b/ast/src/gen/generic.rs
@@ -911,20 +911,20 @@ pub enum Expr<R = TextRange> {
     Slice(ExprSlice<R>),
 }
 
-#[derive(Clone, Debug, PartialEq, is_macro::Is)]
+#[derive(Clone, Debug, PartialEq, is_macro::Is, Copy)]
 pub enum ExprContext {
     Load,
     Store,
     Del,
 }
 
-#[derive(Clone, Debug, PartialEq, is_macro::Is)]
+#[derive(Clone, Debug, PartialEq, is_macro::Is, Copy)]
 pub enum Boolop {
     And,
     Or,
 }
 
-#[derive(Clone, Debug, PartialEq, is_macro::Is)]
+#[derive(Clone, Debug, PartialEq, is_macro::Is, Copy)]
 pub enum Operator {
     Add,
     Sub,
@@ -941,7 +941,7 @@ pub enum Operator {
     FloorDiv,
 }
 
-#[derive(Clone, Debug, PartialEq, is_macro::Is)]
+#[derive(Clone, Debug, PartialEq, is_macro::Is, Copy)]
 pub enum Unaryop {
     Invert,
     Not,
@@ -949,7 +949,7 @@ pub enum Unaryop {
     USub,
 }
 
-#[derive(Clone, Debug, PartialEq, is_macro::Is)]
+#[derive(Clone, Debug, PartialEq, is_macro::Is, Copy)]
 pub enum Cmpop {
     Eq,
     NotEq,
diff --git a/parser/src/context.rs b/parser/src/context.rs
index a607aed..65734d2 100644
--- a/parser/src/context.rs
+++ b/parser/src/context.rs
@@ -4,20 +4,14 @@ pub(crate) fn set_context(expr: Expr, ctx: ExprContext) -> Expr {
     match expr {
         Expr::Name(ast::ExprName { id, range, .. }) => ast::ExprName { id, ctx, range }.into(),
         Expr::Tuple(ast::ExprTuple { elts, range, .. }) => ast::ExprTuple {
-            elts: elts
-                .into_iter()
-                .map(|elt| set_context(elt, ctx.clone()))
-                .collect(),
+            elts: elts.into_iter().map(|elt| set_context(elt, ctx)).collect(),
             range,
             ctx,
         }
         .into(),
 
         Expr::List(ast::ExprList { elts, range, .. }) => ast::ExprList {
-            elts: elts
-                .into_iter()
-                .map(|elt| set_context(elt, ctx.clone()))
-                .collect(),
+            elts: elts.into_iter().map(|elt| set_context(elt, ctx)).collect(),
             range,
             ctx,
         }
@@ -44,7 +38,7 @@ pub(crate) fn set_context(expr: Expr, ctx: ExprContext) -> Expr {
         }
         .into(),
         Expr::Starred(ast::ExprStarred { value, range, .. }) => ast::ExprStarred {
-            value: Box::new(set_context(*value, ctx.clone())),
+            value: Box::new(set_context(*value, ctx)),
             range,
             ctx,
         }