Make fixes for function changes

examples/async.ds

@@ -1,5 +1,5 @@
-create_random_numbers <fn int> |count| {
-mnumbers = [];
+create_random_numbers = <fn int> |count| {
+	numbers = [];
 
 	while (length numbers) < count {
 		numbers += (random_integer)

examples/clue_solver.ds

@@ -4,26 +4,26 @@ all_cards = {
 	weapons = ['Rope' 'Lead_Pipe' 'Knife']
 }
 
-is_ready_to_solve <fn map -> bool> |cards| {
+is_ready_to_solve = <fn map -> bool> |cards| {
 	((length cards:suspects) == 1)
 	&& ((length cards:rooms) == 1)
 	&& ((length cards:weapons) == 1)
 }
 
-take_turn <fn str str map -> map> |opponent_card current_room cards| {
+take_turn = <fn str str map -> map> |opponent_card current_room cards| {
 	(remove_card opponent_card cards)
 	(make_guess current_room cards)
 	cards
 }
 
-remove_card <fn str map> |opponent_card cards| {
+remove_card = <fn str map> |opponent_card cards| {
 	(output opponent_card cards)
 	cards:rooms -= opponent_card
 	cards:suspects -= opponent_card
 	cards:weapons -= opponent_card
 }
 
-make_guess <fn str map> |current_room cards| {
+make_guess = <fn str map> |current_room cards| {
 	if (is_ready_to_solve cards) {
 		(output 'It was '
 			+ cards:suspects:0

examples/yield.ds

@@ -1,6 +1,6 @@
 1 -> (output)
 
-add_one <fn [int] -> [int]> |numbers| {
+add_one = <fn [int] -> [int]> |numbers| {
 	new_numbers = []
 	
 	for number in numbers {

src/value/function.rs

@@ -39,8 +39,21 @@ impl Function {
         &self.return_type
     }
 
+    pub fn r#type(&self) -> TypeDefinition {
+        let mut parameter_types = Vec::with_capacity(self.parameters.len());
+
+        for (_, type_definition) in &self.parameters {
+            parameter_types.push(type_definition.inner().clone());
+        }
+
+        TypeDefinition::new(Type::Function {
+            parameter_types,
+            return_type: Box::new(self.return_type.inner().clone()),
+        })
+    }
+
     pub fn call(&self, arguments: &[Expression], source: &str, context: &Map) -> Result<Value> {
-        let function_context = Map::new();
+        let function_context = Map::clone_from(context)?;
         let parameter_argument_pairs = self.parameters.iter().zip(arguments.iter());
 
         for ((identifier, type_definition), expression) in parameter_argument_pairs {
@@ -123,6 +136,7 @@ impl AbstractTree for Function {
 
 impl Display for Function {
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", Value::Function(self.clone()))?;
         write!(
             f,
             "Function {{ parameters: {:?}, body: {:?} }}",

src/value/mod.rs

@@ -1,7 +1,7 @@
 //! Types that represent runtime values.
 use crate::{
     error::{Error, Result},
-    AbstractTree, Function, List, Map, Table, Type, TypeDefinition,
+    Function, List, Map, Table, Type, TypeDefinition,
 };
 
 use serde::{
@@ -68,17 +68,7 @@ impl Value {
             }
             Value::Map(_) => Type::Map,
             Value::Table(_) => Type::Table,
-            Value::Function(function) => {
-                let parameters = function.parameters();
-                let parameter_types = vec![Type::Any; parameters.len()];
-                let body = function.body();
-                let return_type = body.expected_type(context)?.take_inner();
-
-                Type::Function {
-                    parameter_types,
-                    return_type: Box::new(return_type),
-                }
-            }
+            Value::Function(function) => return Ok(function.r#type()),
             Value::String(_) => Type::String,
             Value::Float(_) => Type::Float,
             Value::Integer(_) => Type::Integer,