Fix concat

src/vm/value.rs

@@ -1,4 +1,9 @@
-use std::{cell::RefCell, collections::HashMap, fmt::Debug, rc::Rc};
+use std::{
+    cell::RefCell,
+    collections::HashMap,
+    fmt::{Debug, Display},
+    rc::Rc,
+};
 
 use crate::{
     ast::{BinaryOperator, UnaryOperator},
@@ -31,7 +36,7 @@ impl LuaFloat {
 
 impl Debug for LuaFloat {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        self.0.fmt(f)
+        Debug::fmt(&self.0, f)
     }
 }
 
@@ -40,7 +45,7 @@ pub struct LuaInteger(pub i64);
 
 impl Debug for LuaInteger {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        self.0.fmt(f)
+        Debug::fmt(&self.0, f)
     }
 }
 
@@ -61,7 +66,7 @@ pub struct LuaBool(pub bool);
 
 impl Debug for LuaBool {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        self.0.fmt(f)
+        Debug::fmt(&self.0, f)
     }
 }
 
@@ -184,13 +189,30 @@ impl From<&str> for Value {
     }
 }
 
+impl Display for Value {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Value::String(value) => Display::fmt(value, f),
+            Value::Float(vmfloat) => Display::fmt(&vmfloat.lua_number().0, f),
+            Value::Integer(lua_integer) => Display::fmt(&lua_integer.0, f),
+            Value::Boolean(lua_bool) => Display::fmt(&lua_bool.0, f),
+            Value::RustFunction(ref_cell) => {
+                write!(f, "<RustFunction({})>", ref_cell.borrow().as_indexable())
+            }
+            Value::Function(closure) => write!(f, "<function({})>", closure.prototype),
+            Value::Nil => write!(f, "nil"),
+            Value::Table(_) => write!(f, "<table>"),
+        }
+    }
+}
+
 impl Value {
     pub fn concat(&self, other: &Value) -> Result<Value, RuntimeError> {
         match (self, other) {
             (
                 Value::String(_) | Value::Integer(_) | Value::Boolean(_),
                 Value::String(_) | Value::Integer(_) | Value::Boolean(_),
-            ) => Ok(Value::String(format!("{:?}{:?}", self, other))),
+            ) => Ok(Value::String(format!("{}{}", self, other))),
             (
                 Value::Float(_) | Value::Integer(_) | Value::Boolean(_),
                 Value::Float(_) | Value::Integer(_) | Value::Boolean(_),