[2017][rust] fmt code

2017/rust/src/day_15.rs

@@ -1,10 +1,17 @@
 use failure::*;
 
 pub fn solve(_: &str) -> Result<String, Error> {
-    let a = Generator{value: 679, factor: 16807};
+    let a = Generator {
-    let b = Generator{value: 771, factor: 48271};
+        value: 679,
+        factor: 16807,
+    };
+    let b = Generator {
+        value: 771,
+        factor: 48271,
+    };
 
-    let answer = a.filter(|a| a % 4 == 0).zip(b.filter(|b| b % 8 == 0))
+    let answer = a.filter(|a| a % 4 == 0)
+        .zip(b.filter(|b| b % 8 == 0))
         .take(5_000_000)
         .filter(|&(a, b)| a & 0b1111111111111111 == b & 0b1111111111111111)
         .count();
@@ -25,4 +32,3 @@ impl Iterator for Generator {
         Some(self.value)
     }
 }
-