add while

single_file_tests/while.rs

@@ -0,0 +1,24 @@
+
+fn main() {
+    let mut cnt = 0_u32;
+    while cnt < 10 {
+        print!("{} ", cnt);
+        cnt += 1;
+    }
+    println!("");
+
+    for i in 0..10 {
+        print!("{} ", i);
+    }
+    println!();
+
+    for i in 0..=10 {
+        print!("{}", i);
+        match i {
+            _ if i % 2 == 0 => print!("[ORD]"),
+            _ => (),
+        }
+        print!(" ");
+    }
+    println!();
+}