eval statements

At this point there isn’t any real difference between expressions and statements

src/twopass.rs

@@ -334,6 +334,31 @@ impl Eval for Expression {
 	}
 }
 
+impl Eval for Statement {
+	fn eval(&self, ctx: &RunContext) -> types::Value {
+		match self {
+			Statement::Assign { target, source } => {
+				let source = source.eval(ctx);
+				match target {
+					Location::Variable { id } => ctx.var(*id).set(source),
+					Location::Field { table, index } => {
+						let table = table.eval(ctx).expect("attempt to index a nil value");
+						let index = index.eval(ctx).expect("attempt to index with a nil value");
+						let types::ValueInner::Table(table) = table else {
+							panic!("attempt to index a non-table");
+						};
+						table.set(index, source)
+					}
+				}
+			}
+			Statement::Call(call) => {
+				call.eval(ctx);
+			}
+		};
+		None
+	}
+}
+
 impl Function {
 	fn call(&self, upvalues: &[types::Value], args: &[types::Value]) -> types::Value {
 		assert_eq!(upvalues.len(), self.upvalues.len());