Avoid rustfmt bug on Windows

Author: Michael Wright

clippy_dev/src/fmt.rs

@@ -44,7 +44,11 @@ pub fn run(check: bool, verbose: bool) {
             let entry = entry?;
             let path = entry.path();
 
-            if path.extension() != Some("rs".as_ref()) || entry.file_name() == "ice-3891.rs" {
+            if path.extension() != Some("rs".as_ref())
+                || entry.file_name() == "ice-3891.rs"
+                // Avoid rustfmt bug rust-lang/rustfmt#1873
+                || cfg!(windows) && entry.file_name() == "implicit_hasher.rs"
+            {
                 continue;
             }