shorten the pretty-print output

Author: HTGAzureX1212

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -663,13 +663,7 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write {
                     p!(print_def_path(def_id, args));
                 } else {
                     let sig = self.tcx().fn_sig(def_id).instantiate(self.tcx(), args);
-                    p!(
-                        "{{function item type ",
-                        print_value_path(def_id, args),
-                        " (",
-                        print(sig),
-                        ")}}"
-                    );
+                    p!("{{fn item ", print_value_path(def_id, args), " :", print(sig), "}}");
                 }
             }
             ty::FnPtr(ref bare_fn) => p!(print(bare_fn)),