increasing complexity for BBC

Author: Mike J H

src/bin/leds.rs

@@ -1,6 +1,6 @@
 #![no_main]
 #![no_std]
-// please don not expect this to compile properly under geany without more assistance
+// please do not expect this to compile properly under geany without more assistance
 extern crate panic_halt;
 // github.com therealprof / microbit
 use core::fmt::Write;
@@ -65,6 +65,11 @@ fn main() -> ! {
             leds.display(&mut delay, checker_a, 1000);
             leds.display(&mut delay, checker_b, 1000);
         }
+        let  mut j = 0 ;
+     (0..5).flat_map(|x| x * 100 .. x * 110)
+        .enumerate()
+        .filter(|&(i, x)| (i + x) % 3 == 0)
+        .for_each(|(i, x)| j=x);    // try these on BBC build
     }
     panic!();
 }

src/bin/leds2.rs

@@ -65,6 +65,11 @@ fn main() -> ! {
             leds.display(&mut delay, checker_a, 1000);
             leds.display(&mut delay, checker_b, 1000);
         }
+     let  mut j = 0 ;
+     (0..5).flat_map(|x| x * 100 .. x * 110)
+        .enumerate()
+        .filter(|&(i, x)| (i + x) % 3 == 0)
+        .for_each(|(_i, x)| j=x);    // try these on BBC build
     }
     panic!();
 }