Accumulator factory: Difference between revisions

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 Changing "x = foo(1.)" to "x = foo(1)" in the code below should not change the output (it does).
-<lang rust>// rustc -V
+<lang rust>// rustc 1.26.0 or later
-// rustc 1.2.0-nightly (0cc99f9cc 2015-05-17) (built 2015-05-18)
 use std::ops::Add;
-fn foo<Num>(n: Num) -> Box<FnMut(Num) -> Num>
+fn foo<Num>(n: Num) -> impl FnMut(Num) -> Num
         where Num: Add<Output=Num> + Copy + 'static {
     let mut acc = n;
-    Box::new(move |i: Num| {
+    move |i: Num| {
         acc = acc + i;
         acc
-    })
+    }
 }