Bless pretty tests.

tests/pretty/dollar-crate.pp

@@ -8,6 +8,4 @@ extern crate std;
 // pretty-mode:expanded
 // pp-exact:dollar-crate.pp
 
-fn main() {
-    { ::std::io::_print(::core::fmt::Arguments::new_v1(&["rust\n"], &[])); };
-}
+fn main() { { ::std::io::_print(format_args!("rust\n")); }; }

tests/pretty/issue-4264.pp

@@ -32,7 +32,7 @@ fn bar() ({
         ({
                 let res =
                     ((::alloc::fmt::format as
-                            for<'a> fn(Arguments<'a>) -> String {format})(((::core::fmt::Arguments::new_v1
+                            for<'a> fn(Arguments<'a>) -> String {format})(((<#[lang = "format_arguments"]>::new_v1
                                 as
                                 fn(&[&'static str], &[ArgumentV1<'_>]) -> Arguments<'_> {Arguments::<'_>::new_v1})((&([("test"
                                             as &str)] as [&str; 1]) as &[&str; 1]),