diff --git a/src/ast.rs b/src/ast.rs
new file mode 100644
index 0000000..3933d84
--- /dev/null
+++ b/src/ast.rs
@@ -0,0 +1,41 @@
+#[derive(Debug, Clone)]
+pub enum Statement {
+	Assign {
+		target: Location,
+		source: Box<Expression>,
+	},
+	Call {
+		callee: String,
+		args: Vec<Expression>,
+	},
+}
+
+#[derive(Debug, Clone)]
+pub enum Location {
+	Variable {
+		name: String,
+	},
+	Field {
+		table: Box<Location>,
+		index: Box<Expression>,
+	},
+}
+
+#[derive(Debug, Clone)]
+pub enum Expression {
+	Constant(Constant),
+	Variable(Location),
+	Call {
+		callee: String,
+		args: Vec<Expression>,
+	},
+}
+
+#[derive(Debug, Clone, Default)]
+pub enum Constant {
+	#[default]
+	Nil,
+	Boolean(bool),
+	Number(i64),
+	String(String),
+}
diff --git a/src/lib.rs b/src/lib.rs
index 85ce649..040ece4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,2 +1,3 @@
+pub mod ast;
 pub mod scope;
 pub mod types;