better error handling, + "ok" in interpret mode only

frustration.rs

@@ -144,7 +144,10 @@ fn create_d(c: &mut Core) {
             create(c, short_name);
             c.post = Post::EatWord;
         }
-        _ => {}
+        _ => {
+            println!(" create needs an argument");
+            c.post = Post::WarmReset;
+        }
     }
 }
 
@@ -456,6 +459,7 @@ fn outer(c: &mut Core, s: &str) {
             Post::WarmReset => {
                 c.tds = 0;
                 c.trs = 0;
+                c.state = State::Interpreting;
                 break; // discard rest of input line
             }
             Post::Nothing => { }
@@ -468,7 +472,13 @@ fn main() {
     loop {
         let mut buf = String::new();
         match io::stdin().read_line(&mut buf) {
-            Ok(_) => { outer(&mut c, &buf); println!(" ok");}
+            Ok(_) => {
+                outer(&mut c, &buf);
+                match c.state { 
+                    State::Interpreting => {println!(" ok")}
+                    State::Compiling => {}
+                };
+            }
             Err(_) => { break; }
         }
     }