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-rw-r--r--tvix/eval/src/value/function.rs9
-rw-r--r--tvix/eval/src/value/thunk.rs5
2 files changed, 9 insertions, 5 deletions
diff --git a/tvix/eval/src/value/function.rs b/tvix/eval/src/value/function.rs
index c9664112f1cd..9ac35d43d837 100644
--- a/tvix/eval/src/value/function.rs
+++ b/tvix/eval/src/value/function.rs
@@ -65,7 +65,7 @@ impl Lambda {
 #[derive(Clone, Debug)]
 pub struct Closure {
     pub lambda: Rc<Lambda>,
-    pub upvalues: Upvalues,
+    pub upvalues: Rc<Upvalues>,
     /// true if all upvalues have been realised
     #[cfg(debug_assertions)]
     pub is_finalised: bool,
@@ -73,10 +73,13 @@ pub struct Closure {
 
 impl Closure {
     pub fn new(lambda: Rc<Lambda>) -> Self {
-        Self::new_with_upvalues(Upvalues::with_capacity(lambda.upvalue_count), lambda)
+        Self::new_with_upvalues(
+            Rc::new(Upvalues::with_capacity(lambda.upvalue_count)),
+            lambda,
+        )
     }
 
-    pub fn new_with_upvalues(upvalues: Upvalues, lambda: Rc<Lambda>) -> Self {
+    pub fn new_with_upvalues(upvalues: Rc<Upvalues>, lambda: Rc<Lambda>) -> Self {
         Closure {
             upvalues,
             lambda,
diff --git a/tvix/eval/src/value/thunk.rs b/tvix/eval/src/value/thunk.rs
index 5107c6328da4..1be13bfe893f 100644
--- a/tvix/eval/src/value/thunk.rs
+++ b/tvix/eval/src/value/thunk.rs
@@ -70,7 +70,7 @@ impl Thunk {
     pub fn new_closure(lambda: Rc<Lambda>) -> Self {
         Thunk(Rc::new(RefCell::new(ThunkRepr::Evaluated(Value::Closure(
             Closure {
-                upvalues: Upvalues::with_capacity(lambda.upvalue_count),
+                upvalues: Rc::new(Upvalues::with_capacity(lambda.upvalue_count)),
                 lambda: lambda.clone(),
                 #[cfg(debug_assertions)]
                 is_finalised: false,
@@ -184,7 +184,8 @@ impl Thunk {
                 if *is_finalised {
                     panic!("Thunk::upvalues_mut() called on a finalised closure");
                 }
-                upvalues
+                Rc::get_mut(upvalues)
+                    .expect("upvalues_mut() was called on a thunk which already had multiple references to it")
             }
             thunk => panic!("upvalues() on non-suspended thunk: {thunk:?}"),
         })