it runs! gets the wrong answer, but runs!

src/bin/ngrun.rs

@@ -58,6 +58,18 @@ fn main() {
         }
     };
 
+    let (errors, warnings) = syntax.validate();
+    let stop = !errors.is_empty();
+    for error in errors {
+        emit(error.into());
+    }
+    for warning in warnings {
+        emit(warning.into());
+    }
+    if stop {
+        return;
+    }
+
     if cli.interpreter == Interpreter::Syntax {
         match syntax.eval() {
             Err(e) => println!("Evaluation error: {}", e),