Oh cool, is_none() exists

implementations/rust/src/lib.rs

@@ -279,7 +279,7 @@ mod decoder_tests {
         assert_eq!(d.read.source.index, 6);
         assert_eq!(d.demand_next().unwrap().value(), &Value::simple_record("Pong", vec![]));
         assert_eq!(d.read.source.index, 12);
-        assert!(if let None = d.next() { true } else { false });
+        assert!(d.next().is_none());
         assert!(if let Err(e) = d.demand_next() { is_eof_io_error(&e) } else { false });
     }
 
@@ -579,7 +579,7 @@ mod samples_tests {
                     })
                 }
                 TestCase::DecodeEOF(ref bin) => {
-                    assert!(if let None = decoder::from_bytes(bin).next() { true } else { false })
+                    assert!(decoder::from_bytes(bin).next().is_none());
                 }
             }
         }