start bird

src/bird/mem.rs

@@ -0,0 +1,12 @@
+use std::collections::HashMap;
+use std::rc::Rc;
+
+#[derive(Debug, PartialEq, Clone, Hash)]
+enum Value {
+    Null,
+    Bool(bool),
+    Number(f64),
+    String(String),
+    Object(HashMap<String, Value>),
+    Array(Vec<Value>),
+}

src/bird/mod.rs

@@ -0,0 +1,8 @@
+mod mem;
+
+use crate::ast::Program;
+
+#[derive(Debug)]
+struct Vm {}
+
+fn execute(program: Program) {}

src/lib.rs

@@ -1,4 +1,5 @@
 mod ast;
+mod bird;
 mod errors;
 mod lex;
 mod parse;