[fine] A wild VM appears!

Untested though

fine/tests/example_tests.rs

@@ -2,6 +2,7 @@ use fine::compiler::{compile, Function, Module};
 use fine::parser::SyntaxTree;
 use fine::semantics::{check, Error, Semantics, Type};
 use fine::tokens::Lines;
+use fine::vm::{eval, Context};
 use pretty_assertions::assert_eq;
 use std::fmt::Write as _;
 
@@ -258,4 +259,23 @@ fn assert_no_errors(tree: &SyntaxTree, lines: &Lines) {
     );
 }
 
+#[allow(dead_code)]
+fn assert_eval_ok(tree: &SyntaxTree, lines: &Lines, expected: &str) {
+    let semantics = Semantics::new(tree, lines);
+
+    let module = compile(&semantics);
+    let main_function = module.functions[module.init].clone();
+
+    let mut context = Context::new(module.clone());
+    match eval(&mut context, main_function, vec![]) {
+        Ok(v) => {
+            let actual = format!("{:?}", v);
+            semantic_assert_eq!(&semantics, None, expected, &actual, "module evaluated");
+        }
+        Err(e) => {
+            semantic_panic!(&semantics, None, "error occurred while running: {:?}", e);
+        }
+    }
+}
+
 include!(concat!(env!("OUT_DIR"), "/generated_tests.rs"));