Adapt pretty tests expected outputs

Author: Voultapher

tests/pretty/autodiff/inherent_impl.pp

@@ -5,7 +5,6 @@
 #![feature(autodiff)]
 #[prelude_import]
 use ::std::prelude::rust_2015::*;
-#[macro_use]
 extern crate std;
 //@ pretty-mode:expanded
 //@ pretty-compare-only

tests/pretty/hir-delegation.pp

@@ -6,7 +6,6 @@
 #![feature(fn_delegation)]
 #[prelude_import]
 use ::std::prelude::rust_2015::*;
-#[macro_use]
 extern crate std;
 
 fn b<C>(e: C) { }

tests/pretty/hir-if-else.pp

@@ -1,6 +1,5 @@
 #[prelude_import]
 use ::std::prelude::rust_2015::*;
-#[macro_use]
 extern crate std;
 //@ pretty-compare-only
 //@ pretty-mode:hir

tests/pretty/if-else.pp

@@ -2,7 +2,6 @@
 #![no_std]
 #[prelude_import]
 use ::std::prelude::rust_2015::*;
-#[macro_use]
 extern crate std;
 //@ pretty-compare-only
 //@ pretty-mode:expanded

tests/pretty/never-pattern.pp

@@ -9,7 +9,6 @@
 #![feature(never_type)]
 #[prelude_import]
 use ::std::prelude::rust_2015::*;
-#[macro_use]
 extern crate std;
 
 fn f(x: Result<u32, !>) { _ = match x { Ok(x) => x, Err(!) , }; }

tests/pretty/pin-ergonomics-hir.pp

@@ -6,7 +6,6 @@
 #![allow(dead_code, incomplete_features)]
 #[prelude_import]
 use ::std::prelude::rust_2015::*;
-#[macro_use]
 extern crate std;
 
 use std::pin::Pin;

tests/pretty/shebang-at-top.pp

@@ -3,7 +3,6 @@
 #![no_std]
 #[prelude_import]
 use ::std::prelude::rust_2015::*;
-#[macro_use]
 extern crate std;
 //@ pretty-mode:expanded
 //@ pp-exact:shebang-at-top.pp