Auto merge of #57944 - estebank:unclosed-delim-the-quickening, r=oli-obk

Deduplicate mismatched delimiter errors

Delay unmatched delimiter errors until after the parser has run to deduplicate them when parsing and attempt recovering intelligently.

Second attempt at #54029, follow up to #53949. Fix #31528.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/libsyntax/util/parser_testing.rs b/src/libsyntax/util/parser_testing.rs
index dbe2b8d39f2..bcf1da66c04 100644
--- a/src/libsyntax/util/parser_testing.rs
+++ b/src/libsyntax/util/parser_testing.rs
@@ -12,8 +12,11 @@ use std::path::PathBuf;
 /// Map a string to tts, using a made-up filename:
 pub fn string_to_stream(source_str: String) -> TokenStream {
     let ps = ParseSess::new(FilePathMapping::empty());
-    source_file_to_stream(&ps, ps.source_map()
-                             .new_source_file(PathBuf::from("bogofile").into(), source_str), None)
+    source_file_to_stream(
+        &ps,
+        ps.source_map().new_source_file(PathBuf::from("bogofile").into(),
+        source_str,
+    ), None).0
 }
 
 /// Map string to parser (via tts)