Handle EOF in repl mode

src/main.rs

@@ -19,12 +19,19 @@ fn run_repl() {
 	let mut line_buf = String::new();
 	loop {
 		match io::stdin().read_line(&mut line_buf) {
-			Ok(_) => {
+			Ok(n) => {
+				// Check for EOF
+				if n == 0 {
+					break;
+				}
+
 				let line = line_buf.trim();
-				run(line).unwrap();
-				line_buf.clear();
+				if !line.is_empty() {
+					run(line).unwrap();
+					line_buf.clear();
+				}
 			}
-			Err(_e) => unimplemented!(),
+			Err(e) => panic!("{:?}", e),
 		}
 	}
 }