Add rustfmt test for formatting for<> before closures

Author: WaffleLapkin

src/tools/rustfmt/tests/source/closure.rs

@@ -51,6 +51,16 @@ fn main() {
                 "--emit=dep-info"
             } else { a }
         });
+
+    for<>          || -> () {};
+    for<         >|| -> () {};
+    for<
+>   || -> () {};
+
+for<   'a
+   ,'b,
+'c  >   |_: &'a (), _: &'b (), _: &'c ()| -> () {};
+
 }
 
 fn issue311() {

src/tools/rustfmt/tests/target/closure.rs

@@ -71,6 +71,12 @@ fn main() {
             a
         }
     });
+
+    for<> || -> () {};
+    for<> || -> () {};
+    for<> || -> () {};
+
+    for<'a, 'b, 'c> |_: &'a (), _: &'b (), _: &'c ()| -> () {};
 }
 
 fn issue311() {