update to reflect changes recommended by @shepmaster his review

src/test/run-pass/try_from.rs

@@ -1,30 +1,23 @@
-// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// 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.
-
-// This test relies on `TryFrom` being auto impl for all `T: Into`
-// and `TryInto` being auto impl for all `U: TryFrom`
+// This test relies on `TryFrom` being blanket impl for all `T: Into`
+// and `TryInto` being blanket impl for all `U: TryFrom`
 
 // This test was added to show the motivation for doing this
-// over `TryFrom` being auto impl for all `T: From`
+// over `TryFrom` being blanket impl for all `T: From`
 
 #![feature(try_from, never_type)]
 
 use std::convert::TryInto;
 
 struct Foo<T> {
-    t: T
+    t: T,
 }
 
-/*
 // This fails to compile due to coherence restrictions
-// as of rust version 1.32.x
+// as of Rust version 1.32.x, therefore it could not be used
+// instead of the `Into` version of the impl, and serves as
+// motivation for a blanket impl for all `T: Into`, instead
+// of a blanket impl for all `T: From`
+/*
 impl<T> From<Foo<T>> for Box<T> {
     fn from(foo: Foo<T>) -> Box<T> {
         Box::new(foo.t)