tokenstream: don't depend on pprust

src/libsyntax/ext/mbe/macro_rules.rs

@@ -174,7 +174,8 @@ fn generic_extension<'cx>(
     rhses: &[mbe::TokenTree],
 ) -> Box<dyn MacResult + 'cx> {
     if cx.trace_macros() {
-        trace_macros_note(cx, sp, format!("expanding `{}! {{ {} }}`", name, arg));
+        let msg = format!("expanding `{}! {{ {} }}`", name, pprust::tts_to_string(arg.clone()));
+        trace_macros_note(cx, sp, msg);
     }
 
     // Which arm's failure should we report? (the one furthest along)
@@ -212,7 +213,8 @@ fn generic_extension<'cx>(
                 }
 
                 if cx.trace_macros() {
-                    trace_macros_note(cx, sp, format!("to `{}`", tts));
+                    let msg = format!("to `{}`", pprust::tts_to_string(tts.clone()));
+                    trace_macros_note(cx, sp, msg);
                 }
 
                 let directory = Directory {

src/libsyntax/ext/proc_macro_server.rs

@@ -2,6 +2,7 @@ use crate::ast;
 use crate::ext::base::ExtCtxt;
 use crate::parse::{self, token, ParseSess};
 use crate::parse::lexer::comments;
+use crate::print::pprust;
 use crate::tokenstream::{self, DelimSpan, IsJoint::*, TokenStream, TreeAndJoint};
 
 use errors::Diagnostic;
@@ -407,7 +408,7 @@ impl server::TokenStream for Rustc<'_> {
         )
     }
     fn to_string(&mut self, stream: &Self::TokenStream) -> String {
-        stream.to_string()
+        pprust::tts_to_string(stream.clone())
     }
     fn from_token_tree(
         &mut self,

src/libsyntax/tokenstream.rs

@@ -14,7 +14,6 @@
 //! ownership of the original.
 
 use crate::parse::token::{self, DelimToken, Token, TokenKind};
-use crate::print::pprust;
 
 use syntax_pos::{BytePos, Span, DUMMY_SP};
 #[cfg(target_arch = "x86_64")]
@@ -23,7 +22,7 @@ use rustc_data_structures::sync::Lrc;
 use rustc_serialize::{Decoder, Decodable, Encoder, Encodable};
 use smallvec::{SmallVec, smallvec};
 
-use std::{fmt, iter, mem};
+use std::{iter, mem};
 
 #[cfg(test)]
 mod tests;
@@ -507,12 +506,6 @@ impl Cursor {
     }
 }
 
-impl fmt::Display for TokenStream {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.write_str(&pprust::tts_to_string(self.clone()))
-    }
-}
-
 impl Encodable for TokenStream {
     fn encode<E: Encoder>(&self, encoder: &mut E) -> Result<(), E::Error> {
         self.trees().collect::<Vec<_>>().encode(encoder)