Rc -> Box

implementations/rust/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "preserves"
-version = "0.1.0"
+version = "0.1.1"
 authors = ["Tony Garnock-Jones <tonyg@leastfixedpoint.com>"]
 edition = "2018"
 description = "Implementation of the Preserves serialization format via serde."

implementations/rust/src/lib.rs

@@ -156,10 +156,10 @@ mod value_tests {
     }
 
     #[test] fn record_mut() {
-        let says = Value::symbol("says").wrap().rc();
-        let mut r = Value::record(&says, vec![Value::from("Tony").wrap(), Value::from("Hello!").wrap()]);
+        let says = Value::symbol("says").wrap();
+        let mut r = Value::record(says.clone(), vec![Value::from("Tony").wrap(), Value::from("Hello!").wrap()]);
         r.as_record_mut().unwrap().1[0] = Value::from("Alice").wrap();
-        assert_eq!(r, Value::record(&says, vec![Value::from("Alice").wrap(), Value::from("Hello!").wrap()]));
+        assert_eq!(r, Value::record(says, vec![Value::from("Alice").wrap(), Value::from("Hello!").wrap()]));
     }
 
     #[test] fn sequence_mut() {

implementations/rust/src/value/decoder.rs

@@ -180,8 +180,8 @@ impl<'a, R: Read> Decoder<'a, R> {
                 if pieces.len() == 0 {
                     Err(Error::Syntax("Too few elements in encoded record"))
                 } else {
-                    let label = pieces.remove(0).rc();
-                    Ok(Value::record(&label, pieces).wrap())
+                    let label = pieces.remove(0);
+                    Ok(Value::record(label, pieces).wrap())
                 },
             CompoundMinor::Sequence => Ok(Value::from(pieces).wrap()),
             CompoundMinor::Set => {

implementations/rust/src/value/value.rs

@@ -1,7 +1,6 @@
 use std::hash::{Hash,Hasher};
 use std::cmp::{Ordering};
 use num::bigint::BigInt;
-use std::rc::Rc;
 use std::vec::Vec;
 use std::string::String;
 use std::collections::BTreeSet;
@@ -40,7 +39,7 @@ pub struct Float(pub f32);
 pub struct Double(pub f64);
 
 /// A Record `Value`
-pub type Record = (Rc<AValue>, Vec<AValue>);
+pub type Record = (Box<AValue>, Vec<AValue>);
 
 pub type Set = BTreeSet<AValue>;
 
@@ -238,10 +237,6 @@ impl std::fmt::Debug for AValue {
 //---------------------------------------------------------------------------
 
 impl AValue {
-    pub fn rc(self) -> Rc<Self> {
-        Rc::new(self)
-    }
-
     pub fn annotations(&self) -> &Vec<AValue> {
         &self.0
     }
@@ -417,8 +412,8 @@ impl Value {
         }
     }
 
-    pub fn record(label: &Rc<AValue>, fields: Vec<AValue>) -> Value {
-        Value::Record((Rc::clone(label), fields))
+    pub fn record(label: AValue, fields: Vec<AValue>) -> Value {
+        Value::Record((Box::new(label), fields))
     }
 
     pub fn is_record(&self) -> bool {
@@ -442,7 +437,7 @@ impl Value {
     }
 
     pub fn simple_record(label: &str, fields: Vec<AValue>) -> Value {
-        Value::record(&Rc::new(Value::symbol(label).wrap()), fields)
+        Value::record(Value::symbol(label).wrap(), fields)
     }
 
     pub fn is_simple_record(&self, label: &str, arity: Option<usize>) -> bool {