std: Remove i18n/l10n from format!

* The select/plural methods from format strings are removed
* The # character no longer needs to be escaped
* The \-based escapes have been removed
* '{{' is now an escape for '{'
* '}}' is now an escape for '}'

Closes #14810
[breaking-change]

1 files changed, 4 insertions, 2 deletions

diff --git a/src/libsyntax/ext/tt/macro_rules.rs b/src/libsyntax/ext/tt/macro_rules.rs
index 6607b6451c0..c4990255719 100644
--- a/src/libsyntax/ext/tt/macro_rules.rs
+++ b/src/libsyntax/ext/tt/macro_rules.rs
@@ -129,11 +129,13 @@ fn generic_extension(cx: &ExtCtxt,
                      rhses: &[Rc<NamedMatch>])
                      -> Box<MacResult> {
     if cx.trace_macros() {
-        println!("{}! \\{ {} \\}",
+        println!("{}! {} {} {}",
                  token::get_ident(name),
+                 "{",
                  print::pprust::tt_to_str(&TTDelim(Rc::new(arg.iter()
                                                               .map(|x| (*x).clone())
-                                                              .collect()))));
+                                                              .collect()))),
+                 "}");
     }
 
     // Which arm's failure should we report? (the one furthest along)