Auto merge of #65399 - Centril:rollup-6lzj0w5, r=Centril

Rollup of 7 pull requests

Successful merges:

 - #65215 (Add long error explanation for E0697)
 - #65292 (Print lifetimes with backticks)
 - #65362 (syntax: consolidate function parsing in item.rs)
 - #65363 (Remove implicit dependencies on syntax::pprust)
 - #65379 (refactor session::config::build_session_options_and_crate_config)
 - #65392 (Move `Nonterminal::to_tokenstream` to parser & don't rely directly on parser in lowering)
 - #65395 (Add some tests for fixed ICEs)

Failed merges:

r? @ghost

1 files changed, 3 insertions, 2 deletions

diff --git a/src/libsyntax/ext/proc_macro_server.rs b/src/libsyntax/ext/proc_macro_server.rs
index 021ec46d987..65037c4a0b8 100644
--- a/src/libsyntax/ext/proc_macro_server.rs
+++ b/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;
@@ -174,7 +175,7 @@ impl FromInternal<(TreeAndJoint, &'_ ParseSess, &'_ mut Vec<Self>)>
             }
 
             Interpolated(nt) => {
-                let stream = nt.to_tokenstream(sess, span);
+                let stream = parse::nt_to_tokenstream(&nt, sess, span);
                 TokenTree::Group(Group {
                     delimiter: Delimiter::None,
                     stream,
@@ -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,