Simplify code

src/libsyntax/parse/mod.rs

@@ -6,6 +6,7 @@ use crate::source_map::{SourceMap, FilePathMapping};
 use crate::feature_gate::UnstableFeatures;
 use crate::parse::parser::Parser;
 use crate::symbol::Symbol;
+use crate::syntax::parse::parser::emit_unclosed_delims;
 use crate::tokenstream::{TokenStream, TokenTree};
 use crate::diagnostics::plugin::ErrorMap;
 use crate::print::pprust::token_to_string;
@@ -141,8 +142,14 @@ pub fn parse_stream_from_source_str(
     source: String,
     sess: &ParseSess,
     override_span: Option<Span>,
-) -> (TokenStream, Vec<lexer::UnmatchedBrace>) {
-    source_file_to_stream(sess, sess.source_map().new_source_file(name, source), override_span)
+) -> TokenStream {
+    let (stream, mut errors) = source_file_to_stream(
+        sess,
+        sess.source_map().new_source_file(name, source),
+        override_span,
+    );
+    emit_unclosed_delims(&mut errors, &sess.span_diagnostic);
+    stream
 }
 
 /// Creates a new parser from a source string.

src/libsyntax/parse/parser.rs

@@ -261,10 +261,8 @@ pub struct Parser<'a> {
 
 impl<'a> Drop for Parser<'a> {
     fn drop(&mut self) {
-        if !self.unclosed_delims.is_empty() {
-            let diag = self.diagnostic();
-            emit_unclosed_delims(&mut self.unclosed_delims, diag);
-        }
+        let diag = self.diagnostic();
+        emit_unclosed_delims(&mut self.unclosed_delims, diag);
     }
 }
 

src/libsyntax/parse/token.rs

@@ -10,7 +10,6 @@ use crate::print::pprust;
 use crate::ptr::P;
 use crate::symbol::keywords;
 use crate::syntax::parse::parse_stream_from_source_str;
-use crate::syntax::parse::parser::emit_unclosed_delims;
 use crate::tokenstream::{self, DelimSpan, TokenStream, TokenTree};
 
 use syntax_pos::symbol::{self, Symbol};
@@ -675,9 +674,7 @@ impl Nonterminal {
         // FIXME(#43081): Avoid this pretty-print + reparse hack
         let source = pprust::nonterminal_to_string(self);
         let filename = FileName::macro_expansion_source_code(&source);
-        let (tokens_for_real, mut errors) =
-            parse_stream_from_source_str(filename, source, sess, Some(span));
-        emit_unclosed_delims(&mut errors, &sess.span_diagnostic);
+        let tokens_for_real = parse_stream_from_source_str(filename, source, sess, Some(span));
 
         // During early phases of the compiler the AST could get modified
         // directly (e.g., attributes added or removed) and the internal cache
@@ -740,13 +737,7 @@ fn prepend_attrs(sess: &ParseSess,
         let source = pprust::attr_to_string(attr);
         let macro_filename = FileName::macro_expansion_source_code(&source);
         if attr.is_sugared_doc {
-            let (stream, mut errors) = parse_stream_from_source_str(
-                macro_filename,
-                source,
-                sess,
-                Some(span),
-            );
-            emit_unclosed_delims(&mut errors, &sess.span_diagnostic);
+            let stream = parse_stream_from_source_str(macro_filename, source, sess, Some(span));
             builder.push(stream);
             continue
         }
@@ -763,13 +754,7 @@ fn prepend_attrs(sess: &ParseSess,
         // ... and for more complicated paths, fall back to a reparse hack that
         // should eventually be removed.
         } else {
-            let (stream, mut errors) = parse_stream_from_source_str(
-                macro_filename,
-                source,
-                sess,
-                Some(span),
-            );
-            emit_unclosed_delims(&mut errors, &sess.span_diagnostic);
+            let stream = parse_stream_from_source_str(macro_filename, source, sess, Some(span));
             brackets.push(stream);
         }
 

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()