Simplify code

src/libsyntax_ext/proc_macro_server.rs

@@ -12,7 +12,6 @@ use syntax::ast;
 use syntax::ext::base::ExtCtxt;
 use syntax::parse::lexer::comments;
 use syntax::parse::{self, token, ParseSess};
-use syntax::parse::parser::emit_unclosed_delims;
 use syntax::tokenstream::{self, DelimSpan, IsJoint::*, TokenStream, TreeAndJoint};
 use syntax_pos::hygiene::{SyntaxContext, Transparency};
 use syntax_pos::symbol::{keywords, Symbol};
@@ -410,14 +409,12 @@ impl server::TokenStream for Rustc<'_> {
         stream.is_empty()
     }
     fn from_str(&mut self, src: &str) -> Self::TokenStream {
-        let (tokens, mut errors) = parse::parse_stream_from_source_str(
+        parse::parse_stream_from_source_str(
             FileName::proc_macro_source_code(src.clone()),
             src.to_string(),
             self.sess,
             Some(self.call_site),
-        );
-        emit_unclosed_delims(&mut errors, &self.sess.span_diagnostic);
-        tokens
+        )
     }
     fn to_string(&mut self, stream: &Self::TokenStream) -> String {
         stream.to_string()