Adapt pretty tests expected outputs

Author: Voultapher

tests/pretty/autodiff/inherent_impl.pp

@@ -3,7 +3,8 @@
 //@ needs-enzyme
 
 #![feature(autodiff)]
-#[macro_use]
+#[prelude_import]
+use ::std::prelude::rust_2015::*;
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/hir-delegation.pp

@@ -8,6 +8,7 @@
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;
+extern crate std;
 
 fn b<C>(e: C) { }
 

tests/pretty/hir-if-else.pp

@@ -2,6 +2,7 @@
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;
+extern crate std;
 //@ pretty-compare-only
 //@ pretty-mode:hir
 //@ pp-exact:hir-if-else.pp

tests/pretty/if-else.pp

@@ -1,6 +1,7 @@
 #![feature(prelude_import)]
 #![no_std]
-#[macro_use]
+#[prelude_import]
+use ::std::prelude::rust_2015::*;
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/never-pattern.pp

@@ -7,7 +7,8 @@
 #![allow(incomplete_features)]
 #![feature(never_patterns)]
 #![feature(never_type)]
-#[macro_use]
+#[prelude_import]
+use ::std::prelude::rust_2015::*;
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/pin-ergonomics-hir.pp

@@ -8,6 +8,7 @@
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;
+extern crate std;
 
 use std::pin::Pin;
 

tests/pretty/shebang-at-top.pp

@@ -1,7 +1,8 @@
 #!/usr/bin/env rust
 #![feature(prelude_import)]
 #![no_std]
-#[macro_use]
+#[prelude_import]
+use ::std::prelude::rust_2015::*;
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;