Add run-rustfix where it already passes

tests/ui/unreadable_literal.fixed

@@ -0,0 +1,29 @@
+// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// run-rustfix
+
+#[warn(clippy::unreadable_literal)]
+#[allow(unused_variables)]
+fn main() {
+    let good = (
+        0b1011_i64,
+        0o1_234_u32,
+        0x1_234_567,
+        65536,
+        1_2345_6789,
+        1234_f32,
+        1_234.12_f32,
+        1_234.123_f32,
+        1.123_4_f32,
+    );
+    let bad = (0b11_0110_i64, 0x0123_4567_8901_usize, 123_456_f32, 1.234_567_f32);
+    let good_sci = 1.1234e1;
+    let bad_sci = 1.123_456e1;
+}